I just found that Dark Horse printed some sweet collections of some older Aliens comics. I've always been a huge Aliens fan, and to a lesser degree Predator.

Aliens Omnibus, Vol. 1, Aliens Omnibus, Vol. 2, Aliens Omnibus, Vol. 3, Aliens Omnibus, Vol. 4, Aliens Omnibus, Vol. 5, Aliens Omnibus, Vol. 6

There are six of them!!! They also have a couple Predator omnibuses (omnibi?) and Aliens vs Predator omnibuses

Predator Omnibus Volume 1, Aliens vs. Predator Omnibus, Vol. 1

If I had any disposable income right now it would all go in to these books!

Update: Oh man, there are some Terminator Omnibuses also!