I agree with flori here, start at 500, it's the price for 10000 and less for corporate publication. And yes, 500 PER IMAGE.
Stocky brings up a good point, if you uploaded your photos to something like flickr, facebook, etc, you may be screwed. If you only have them on your personal site, hit them with the book. Just explain to them that a one time retroactive license will be XXX dollars per image for X number of images for a total of XXXX dollars, and they have 15 days to comply before legal action is taken. For now, register your images with the copyright office so if you do have to bring it to court, you'll be able to get your money.
I don't hate macs or OSX, I hate people and statements that portray them as better than anything else. Macs are A solution, not THE solution. Get a good desktop i7 with Windows 7 and come tell me that sucks for photo or video editing.