Bobbie,
I use two (free) programs. I edit / crop / straighten photos with Picasa. Then click on the "Export" tab and resize the picture to 800 pixels.
Next, I use Photobucket to upload the photo from the Export file I've saved on my Desktop, to my Library. Then, for Tomatoville postings, copy the "IMG" file option and paste it into your Post. It's that simple.
Raybo