Relative statement, A95 is 5 megapixle, A510 3.2 megapixle. Unless your going to print posters, the extra megapixels don't do much other than fill up the SD card faster. Don't get me wrong A95 is very nice, but he A510 has some advantages including about $90 cheaper.
A510= 2 batteries, A95= 4 batteries (and is still more efficient than the A95)
A510 smaller and lighter
A510 4 x zoom, A95 3 x zoom (optical)
Both have the same movie mode specs.
A510 $174 delivered from PC nation ( I got in on a one day sale elsewhere $152 delivered)
http://www.pcnation.com/web/details.asp?item=P33598
A510 review (steve's, camera)
http://www.steves-digicams.com/2005_reviews/a510.html
Steve likes the A95 as well