On the topic of 'Auditing' your game collection it definitely is a great feeling. Some things I would also do.
1. Make sure you have everything you own for the game listed too so you know what you're missing (manuals, art, bad shape disc, etc.)
2. Clean up everything real nice if you have time.
3. TEST everything!!! I can't tell everyone here how nice it is to have tested everything I own in late August and know everything works, now I can just test games as I get them in and it is so much easier.