I sent you an e-mail reply about this... but I'll post a copy here just in case you didn't get the e-mail...
I don't personally do anything with Froogle... but here's some tips I picked up from others...
-add lots of extra columns - as many as you can
-add pictures to your products
-make sure your product title is spot on
-spice up your descriptions and add extra keywords to em
-use country/language specific XML tags if you're selling in those markets
hope that helps
