Yes, the jQuery plugin is working, but not in a good manner. If i show this plugin the jQuery community, oh god …. I can hear what they say. Anyway, I upload in a couple of days this example to gt some feedback with Firefox, Opera, Safari and all other silly browsers.
Today I go back to my good old PHP and implement a better memory checking. I get some feedback that the thumbnail generation ends into an white screen, so I rework the checking for memory : A picture with 800 x 600 could cause already a error if the server limit is 8-12 Mbyte.
The image itself need 1-2 Mybte , but a WordPress Installation with a couple of plugin requires very fast up to 10 MByte (this is what I measure at my localhost system).