As you said, it's a little late now that the program has been deleted.
Most uninstaller rely on being present when the application is installed so that it can keep a record of what went where.
You will find most of the stuff in the your library, usually under the makers or apps name, with more stuff in the other library.
You might try reinstalling // where you "may" find the uninstaller program. Some programs have the uninstaller built into the installer.
Yep, iLife can be removed if you do not use it.
Format and install itself is so simple and easy that you must have something else going on for it to be a pain.
Factory installations of OS X really do not contain much above the core OS and the core Apps, unlike the gigs of crapware installed on a new Winbox. Trial versions of Office & iWork are about the only "unsolicited" stuff in OS X
I have a Mac Mini, Leopard, etc etc etc.
Now, uninstalling software isn't as clean cut as I originally thought. A lot of applications leave crap in other places, yet don't actually offer any opportunity to 'uninstall' it - dragging it to the bin is all you are given. Anyway, a wee while I ago I installed parallels, and tried to get it to work... panicking the OS. I promptly thought 'to hell with that!' and chucked the whole entire parallels folder in the bin and emptied. Now, parallels is gone, but it's left a trail of junk in the OS. The airport configuration sidebar to name 1. Hell, I think there are even some processes running that belong to that POS. What I am looking for is an application to essentially get rid of the junk that is left behind. I have heard of 'Appdelete' and similar programs, but that only seems to work when you er, haven't already deleted the application in question.
Also, going slightly off topic here, but there is a lot of junk that comes with Macs that I just don't use. Most of the iLife suite is useless to me, and a lot of the stuff that comes on the OS could probably be removed. If I get rid of this stuff now will it be any good? Or should I just junk the OS, format and reinstall with only the stuff I actually need? Formatting would be a royal pain in the **** to be honest but factory installations of computer operating systems do tend to be rather full on.