Mrs A's got one of those too.
Have a wander round this site. There's loads of info - but you sometimes have to hunt for it. Look out for the pull-down menu buttons. They have some good tables of the main features.
http://www.steves-digicams.com/
I always try to bear in mind the total cost of ownership. How much are spare batteries? What expansion cards are available?
I took a long look at the expansion card market and plumped for Compact Flash. See
this post. Now, I wouldn't buy anything that didn't take AA batteries and have a Compact Flash socket. That's why I recommended the Canon.
Edit
Oh, and don't be conned into getting more megapixels than you need. Follow the 'www' link below to see my efforts with a lowly 2.1 megapixel camera. Even the biggest pictures on those pages are only 1/4 of that resolution. Some of my photos are spoilt more by camera shake and poor focussing than by lack of resoulution. Mind you, I hardly ever make prints from them - so, I guess, it depends what you have in mind.