I've only just started to get into PVP in TBC having been a moderate but not hardcore PVPer in WoW 1.0 and have also found playing with a full feral spec, particularly in larger group (5v5 for example) situations to be pretty frustrating. Bear damage obviously isn't stunning, cat's still squishy of course and with a 1/46/14 or similar talent build you've got nothing in the way of healing boosts to play with. Solo wise it's still a pretty strong build of course but teamwork's very much the focus of high level PVP.
If I was seriously focused on PVP exclusively I'd be looking at a 8/11/42 swift build or similar - interuption protection on CC, feral charge and a whole lot of healing potential allowing solid healing combined with a fair bit of flexible harassment of opponents.
Regarding a hybrid build though as you're seeking my inclination's towards a 1/29/31 build, something like (note, rough concept only, details will vary)
http://www.wowhead.com/?talent=MzZxhGsfboLZVEIzMq00o . Gives you a fair number of the tanking talents, some tolerable dps solo and a fair bit more healing punch than a 21 resto build - swiftmend really does add a lot to a druid's healing potential plus the other points certainly aren't wasted either.
Personally my focus is still on feral PVE for the moment so I'm simply sticking with a 1/46/14 build and going to work on gear/practice/a team instead, really depends just how you want to spread your focus though, going to have to sacrifice something to get anything.