That's a great thread.. hope some of them works on my old beige G3 desktop
I am making the thumbs in photoshop by hand... cropping properly cannot be automatized.
Here is my addition
http://simplethumbs.de/ free and nice.
I am using sometimes Photopage, don't like Phototimesaviour and my all time favorite is Webpics.. hope I find it. Here you go
http://www.splons.com/m3/webpics/