Well, that's probably the last version (by now...) if everything is right and anyone finds bugs. Changes:

• code clean up, until my knowledge allows
• "Best sellers" and "Cheapeast" blocks function splitted on separate functions to be reused (theme functions)
• both blocks allow to be choosen how many rows they will show from the settings page between 1 and 4
• the corresponding settings at the settings page for catalogue
• both blocks appears as regular-drupal-blocks on the admin blocks page to be used anywhere on the site (although preferably at bottoms or so since they build quite a wide content
• best sellers select now properly selects the best seller ones from the uc_order_products table

If nobody complains that's my proposal for the uc_catalog.module upgrade and thus I would like Lyle and Ryan to check them. New features could come for future releases but I would prefer to have that optimized and promoted to core if uber-team so considers
Keep comming your comments.