I saw on the official boards a thread where someone linked to the talent builds for the original World of Warcraft beta. I'm linking the oldest ones for each class available
Druid:
http://wowvault.ign.com/View.php?vie..._id=8&build=b5
Warrior:
http://wowvault.ign.com/View.php?vie..._id=5&build=b4
Mage:
http://wowvault.ign.com/View.php?vie..._id=4&build=b4
Priest:
http://wowvault.ign.com/View.php?vie..._id=6&build=b4
Shaman:
http://wowvault.ign.com/View.php?vie..._id=8&build=b5
Rogue:
http://wowvault.ign.com/View.php?vie..._id=7&build=b4
Warlock:
http://wowvault.ign.com/View.php?vie...id=10&build=b6
Hunter:
http://wowvault.ign.com/View.php?vie...y_select_id=11
Paladin:
http://wowvault.ign.com/View.php?vie...y_select_id=12
Quite possibly the most interesting is the warrior one as it was the first one designed (alongside mages) and it shows the changes that have been made to the philosophies. Prerequisites are often haphazardly placed. New abilities were placed as 16 point talents, 26 point talents and then maybe another at 31. Improved heroic strike is required if you want to get improved rend. You had to spend three total points in improved shield block in order to pick up improved shield bash which gave it +20% chance to hit. I don't know what they think you'd be fighting where you'd need +20% chance to hit with a special. Most impressively, improved disarm was actually weakened from the beta tree to the current tree, giving half the return.
In the fury tree, you get an amazing return with your first 15 points picking up cruelty, flurry, and enrage. There's then a lot of filler. At the end of the tree you see their old philosophy. They didn't want to confuse new players and allow them to improve an ability through talents before they obtained them, so all of the talents that improved abilities that required you to be level 30 for berserker stance required you to place 30 points in the tree first. (You could get your first talent point at level 2 originally). The same applied to a few other talents for other classes, like improved grace of air totem and improved spellstone.
In other cases it's just impressive how much they've condensed some of the talents. For example, if a druid wanted 5-6% feral critical strike chance, critical strikes with abilities to give combo points or rage, 10% additional armor in forms, and increased base attack power in cat, it would take a beta (or earlier retail) druid 25 talent points to do so. In the expansion, the same talents (some now even more effective) cost a total of 11 points.
There are a few talents that were removed which it would actually be nice to have back. For example, priests had a talent that let more of their spirit regeneration work after a critical spell strike, and they'd also love to have a combat res. I know some hunters still miss the old spirit bond.
Overall it's impressive how far they've come and amusing to try to figure out what the hell they were thinking in other cases.
edit: added older rogue build