My image collection is almost at 250...yeah I know, I never thought I'd get this far either.
I have been using a lot of these types of micropayment websites lately - the key is keywording your jpeg images with an IPTC / EXIF editor, either in Adoboe Photoshop, or just download the free program called IrfanView.
I'm trying to see if one site sells more images than the next. I read that these ones below are a lot better than BigStockPhoto (besides iStockPhoto, which I haven't tried yet - since I hear they are like nazi's for image quality)
Here are the links once again - sign up, and try it out.
BigStockPhoto: (I've sold tons of images on this site, I still sell 1-3 a day at least)
http://www.bigstockphoto.com/?refid=GOUVAfUzdT
Dreamstime: (I am in the process of uploading my images, it just sucks because they don't have ftp upload support - and ftp upload makes life a heck of a lot easier / much faster)
http://www.dreamstime.com/res66228
Shutterstock (supports ftp upload also - I hear most people make the most sales with this one, I'll find out soon enough)
http://submit.shutterstock.com/?ref=59783
Fotolia: (supports ftp upload as well - in the month of February every image you get accepted, you get like free credits, or money or something- there's details on the site)
http://www.fotolia.com/partner/33662
Fotolia, Shutterstock, and BigStock all have multi-file ftp uploads, where Dreamstime does not. FTP makes things so much easier, since most image are over 1 megabyte.
If you've got any questions, feel free to ask them guys Thanks