The crit cap is really never relevant for feral druids; it's only a concern for dual-wielders, and even then, only for those without solid +hit.

A feral attack table (attacking from the front, no +hit gear) might look something like this:

5% miss
5% dodge
5% parry
5% block

15% glance
35% hit
30% crit

With this table, you'd have to have a 65% crit rate before you hit the crit cap.

If we assume a dual-wielder (again, attacking from the front, no +hit gear) we might see a table like the following:

24% miss
5% dodge
5% parry
5% block

15% glance
16% hit
30% crit

This character would be at the crit cap only if they have a 46% crit rate and are attacking from the front. When you attack from behind, you turn 10% (5% block / 5% parry) of avoided attacks into hits. These hits are then eligible to crit, raising the crit cap to 56%. Additionally, every piece of +hit gear (until you hit the hit cap) also raises the crit cap by the same amount.

I'll play with google spreadsheets as that's probably accessible from work whereas rapidshare may be hit or miss. When it gets online I'll edit this post to indicate that it is up and running.

Edit: Ok, it's online and seems to be functional as a google spreadsheet here. You'll need the following to use it (Apologies for the sheer messiness of the sheet, but I never really thought it would go into public consumption :P.):

• Your Feral (CAT) AP
• Your Feral Crit%, not rating (enter as a whole #; it'll get converted to a % later)
• Your Hit%, not rating (enter as a whole #)
• Your Feral Weapon Skill Rating (yeah, I'm consistent, aren't I? :P)

You'll want to enter the above in the BASE column starting at Cell B8.

Once these are entered, it'll do the standard 'what if we had 1 more of Y' to your stats (I never made hit work because it would require some extra formula changes and I'm lazy; just enter +1 hit rating into a custom gear set if you want to see how valuable the sheet thinks it is) as well as provide two areas to plug in custom additions/subtractions.

Here are the assumptions the sheet is making:

• You have my talent build; the AP and Damage multipliers are hard-coded in.
• The attack cycle you are using is 88 seconds long, starting with 0 energy and a mangle debuff that has JUST been applied (t=0) to the completion of that cycle (t=88) with a new mangle being applied and 0 energy being available.
• Cat Form's MH Weapon is a 55dps 1.00 speed 1H weapon with 8.64% Miss Chance on both Yellow and White attacks.
• Glancing blows occur 25% of the time and reduce damage by 25%
• You are attacking from behind and thus not subject to Block & Parry (only 5.6% Dodge / 8.6% Miss)
• You never use Ferocious Bite or a 4 CP Rip
• You receive 0% damage reduction from armor (so, best case scenario). I didn't put in DR because this was simply made to show relative effectiveness and not tell you your theoretical damage output ^^;;

Caveats:

• Some of the formulas may be slightly off; I corrected them and updated some things last night but there is plenty of room for error remaining.
• The 'attack cycle' I generated fudges numbers slightly for critrates different than 25%; the base 88 second cycle worked FLAWLESSLY for a 25% critrate but a higher/lower rate will yield additional/fewer CP (and thus more/less rips). I just decided to scale combo point generation upwards by a fixed ratio of (YourCritrate - 25%) / 25% rather than do more exact calculations.
• Omen of Clarity is not taken into account. I decided not to model it because I'd have to resort to a fixed decrease in cost of all skills over the 88 second cycle timeframe and I'm not sure what kind of PPM I'd want to target.
• The 'AP' value of each stat is relative and compared to the raw stats that you provided. I generated a number to normalize by in order to get +1 AP to be worth 1 AP and +1 Str to be worth 2.4 AP but even that only holds true in the general case (it's close, but not quite perfect).
• Agi appears to be oddly overvalued. Considering that it contributes to not only AP but to crit as well as combo point generation may explain this though.
• The AP Contribution to Rip is based on my own testing; 0.24*AP was way WAY too low whereas 0.4*AP is about right.
• +Skill adds 0.1% Hit and 0.2% Crit; I know the hit is most likely correct but I'm unsure about the +Crit value.
• I made this a while ago so some decisions & values don't make 100% sense to ME anymore, such as why I decided that Rip DPS should be calculated over 13.5 seconds rather than 12. There WAS a good reason though... I think ^^;;.
• The "Additional Stats" table uses ratings and not % for Hit/Crit/etc.
• The "Paired" DPS entry is somewhat broken at the moment; it was going to indicate your damage output with someone else putting mangle up, saving you the energy cost and allowing you to shred instead. Unfortunately, I never really followed through with that and it's safe to ignore.
• No outside buffs can be applied. If you want to modify your AP/stats to simulate a buff, you have to do so manually ><.
• I'm sure there are more ><

*cough*I just posted a spreadsheet that should do that*/cough*

*innocent whistle*

The Rip formula seems to be (1092 x 1.3 x 1.1 + .24 x AP) x 1.3 x 1.1. The 1.3 and 1.1 outside the parentheses are from the Mangle debuff and Naturalist, while the 1.3 and 1.1 inside the parentheses appear to apply regardless of spec.

[Rogue]: Rupture Formula