to add to the common problems list....
transmission - 2nd gear synchro likes to be shredded into shit. sucks driving next to a hot chick in a srt-4 or somethin and have her hear you grind 2nd
clutch - stock clutches are shitty. they CAN take a beating, but don't expect them to last very long if you beat on them. they like to chatter after a while. also the master cylinder. if one of the seals ever go bad, you'll have a 'ghost pedal'. (pedal sinks all by itself with light pressure applied). stock t/o bearings are excellent.
engine - CW (crankwalk) isn't as common as a lot of people think. i HAVE had it, though. first week i had my car, motor was shot due to cw. wish i would have know about cw back then
also, lifter tap is annoying. a heavier, full synthetic oil can help this. use lucas treatment and it's almost eliminated. umm, as for oil leaks...there is something wrong with your eclipse if it DOESN"T have an oil leak lol. every dsm i've seen has at least one lol. mmmmm, nothing else to really note on the motor. just take good care of it. do regular maintnence, change oil every 3k, etc etc you'll be fine.
other than that, these cars are excellent. there are also a lot of free mods you can do by yourself to help with performance. all in all hp is pretty cheap for these cars.