Website Thumbnail Image Generating Services

SimpleAPI is a free service to generate a screenshot image captured from any website you want. This service is started in this March.
<img src="http://img.simpleapi.net/small/http://www.kawa.net/">

Two months later, Hatena also released Hatena::Screenshot service for thier blog service's users. Registered users can post a blog which includes screenshots by writing the special wiki markup following:
[http://www.kawa.net:image] ( size: midium )
[http://www.kawa.net:image:large] ( size: large )
[http://www.kawa.net:image:small] ( size: small )

Snapshot service is an yet another service which has no Japanese manuals ;)
You can specify height and width of the thumbnail image generated by this service.
<img src="http://webdesignbook.net/snapper.php?w=160&h=120&url=kawa.net/">