BR Drive Failure 9-25-08 (repaired by sony $150)
YLOD Victim 1-6-09 (repaired by myself $10)
BR Drive Failure 12-02-09 (repaired by myself $60)
Repaired over 100 RROD and 30 YLOD/Ps3 failures.
Note to SONY: Fix the browser!
some games are more likely to freeze up on you than others also. I know fallout 3 has frozen up on me twice in a month and killzone 2 hasnt ever. other than that my PS3 has only frozen up on me while browsing or in the XMB when exiting the browser.(most of the time you can turn off your java script to help with that.) I dont think my PS3 has ever frozen up while browsing with the java script turned off.
Other freeze ups I've heard of but I havent experienced...Receiving message from friends while in game/writing text messages. But I dont use those features really.
All of the above are quite common I think and arent clues to a broken PS3 nessessarily.