I'm trying to go back and beat as many games as possible before buying anything new. I just beat Gears of War and Guild Wars: Prophecy (Campaign). I'm currently working on Bioshock and the original Metroid. After that will be Mass Effect.

 Edit: I also just beat Darwinia.

I'm so close to finishing GTA IV (I have unlocked the finale missions, but don't know which to do!)

I beat MK Wii yesterday. (i.e. I got all the gold cups in all classes)

Just beat GTA4 story mode, I'm up to 75.8% completion still have to do a few assassins missions, steal 29 cars, do 27 most wanted missions, kill 198 flying rats, do 49 stunt jumps and a few more things !( take friends out to every location available for them and find all the random encounters..).

I finished No More Heroes a couple of hours ago. I needed it to get out of my system before I go on to my thesis and prepping for a presentation. I'll keep a software draught from now till the end of June when the vacation starts.

In the meanwhile I'll be busy with Medieval 2 total war for my second campaign.

@ Esmoreit:

I finished also No more Heroes in hard mode. Good luck for your thesis.

I finally beat all songs of guitar hero 3 on expert difficulty, that including the downloadable ones (free ones) and the extra ones. Yeah this means I have beat The Devil Went Back to Georgia and Through the Fire and Flames in expert. Only 2 songs remaining in normal setlist to clear with 5 stars, those being raining blood and number of the beast.

Just beat GTA IV, in 27 hours

What's your completion ?

Took me 55 hours to beat it with 75% completion rate ( and honestly it's more like 60 hours as 2-3 times after failing the same mission several times in a row I reloaded the game instead of retrying the mission from the cellphone).

Well, the last post is just four days old, so this isn't considered necroing... I think? Anyway.

Just beat my First Fire Emblem game - FE: Sacred Stones on normal.

Figured it would've been harder due to the reputation of the series, but the sacred twin weapons, skirmishes and tower/ruin grinding made the endgame a cakewalk. The last four boss fights consisted mainly of ROSS AX MURDER with some backup by Amelia, Ephraim and Neimi.

A good game and certainly a challenge for the average player, but didn't have the murderous edge that you'd expect from a FE game.