I used to use Xfire until it got even more ads, even crappier UI design, and started partnering with all kind of pointless companies. Then,it finally got to the point where it was slow and the in-game overlay was miles behind everyone else.XFire delivers that for me. In fact, it delivers everything else that Steam has, minus the distribution and DRM.
I use Raptr to augment Steam and have no complaints, really. The Raptr in-game overlay is much nicer and it supports other chat clients (MSN/Yahoo/GTalk/etc). Raptr was also started by the guy that founded Xfire.
Egg. On my face.Fallout 3, GTA 4, BioShock 2, Bulletstorm, Batman: Arkham Asylum, Section 8, Street Fighter 4, Red Faction: Guerrilla, Dead Rising 2, and a bunch of others.