Bo, JPEG Wizard can be downloaded from http://www.jpg.com it's not on PSP.
Felix, I started using JPEG Wizard very recently because almost all my photos were being rejected and it was time to change something. Like Dean said it's not easy to identify the errors in the scanning process and even now I'm having photos rejected and I simply don't understand why when comparing my photos with others in the database.
I like JPEG Wizard because I get a feeling that the image suffers less compression than using PSP 5. With a final scan of about 500-600 bytes I just compress once and the size is reduced to 250-300 bytes. As I have a slow connection I compress just once again and the file goes to 150-180 bytes and I don't see any difference in the quality.
When I was using PSP 5 compression at level 5 or 6 the files were around 200 bytes and I did notice some little changes due to the compression.
To be honest I don't really know what to do because the reasons for rejections are vague but since I started using JPEG Wizard together with saving the first scan as .TIF, my acceptance rate increased so at least in the near future I'll keep this way.
Just as example, I have this photo being rejected some times. I don't think it's a bad angle or bad quality. The scanning process for this photo was exactly the same as for other accepted photos. I only see the flowers out of focus and obviously blurried but that was the effect I was looking for. So I would like to know if this photo can be accepted with a better scanning or if just doesn't enters in Johan tastes because the rejection email doesn't clarify that.
P.S. If the photo don't show up here's the link: http://www.geocities.com/airluis2/yes_l1011_cstmr_0301_4.jpg