Comparing the Canon A510 against the Olympus D595. The A510 wins hands down. The D595 has atrocious image quality.
This is coming from someone who up until a couple of months ago had been using an Olympus D40. I have yet to find a non-slr camera that really has much better picture quality than it.
Here is a review for the D595 (It's known as the C-500 in Europe):
PhotographyBlog
Look at the pictures, they look horrible at full zoom.
The reviewer sums it up nicely: "The Olympus C-500 Zoom is one of those cameras that you would be perfectly happy to receive as a gift for Christmas, but which wouldn't actually be that high on your own shopping list."