its Castles and Ruins
i in fact have it as well... got it as a pdf... its just a scan of the old book but, you can find it at ICE's store. Its the amount of detail they put into their sourcebooks that makes me love them...
And as far as healing surges and such... i'm much more hardcore then dnd i guess... i KNOW not a lot of people are like i am when it comes to playing, so surges is a good idea... but for me, the much more terrifying possibility of you OR your opponent getting a simple lucky hit that crushes your pelvis, severs an artery, or just plain lops off a limb is where i like to be... HARP's attacks have several effects like - to actions, stunned, bleeding per round, broken bones, severed limbs etc... while i do edit my monsters attack results so that i don't kill or maim my players all the time, i often let broken bones, and such slip by... and without instant cure-all magical fixes, it makes people go into combat with a little hesitation, and a lot of planning... (i like tactics)... basically, i made any magical healing an out of combat option... usually by changing its cast time...
4th ed sounds interesting, and i'm sure i'll end up trying it some time... tho i've heard plenty of people talking about it... and they've been busy crunching numbers so that when their DM switches, they'll have the best possible character they can have... i'm sure it won't take long to find some loopholes to create the munchkin characters. its just how some people play... and in my experience, those players are almost always playing dnd... guess being the biggest and most popular rp system is a benefit and curse.