Jamba (of course), DBM, Auctioneer on my main and my Auction alt, Informant etc.
I was using Bartender4, but I found a really unusual behaviour with it that I couldn't fathom nor fix. Some of my Action Bars started duplicating action bar 1. If I removed the duplicated spells from the other action bar, it'd then remove them from Action Bar1! I eventually had to disable the mod.
With click and cast sequences and the like, I'm finding (so far anyway) that I can easily accomodate all the keys I need in Blizz' standard bars anyway (all Paladin team helps I guess).