Yep, Southern, Crucial is correct. I have the 17 inch G5 with iSight. Just got the 2 gig stick from Crucial. All the memory tests such as the Apple Hardware Test and Rember (search it on google, very good testing program) say the RAM is "good."
Only ONE issue during installation tho... you have to push the RAM in REALLLLLLLLLY hard to get it seated. It has to "click."
Good Luck