I have oscThumb installed in my shops. http://www.oscommerce.com/community/contributions,5491
It's running fine, but it throws a bunch of errors when my sites are run using the W3C markup validation service. Maybe not a big deal, or maybe it is. I don't know.
I am considering switching to On the Fly thumbs: http://addons.oscommerce.com/info/2226
I am interested in the pros and cons when compared to one another, both for 2.2 and 2.3.1 shops.
Thanks