That's a very good question, and one which will take a while to list - But here I go!
There are many categories in ebay and naturally each one is popular and each one has it's best selling items or brands.  It would be nearly impossible for a mere mortal to get this information for himself - So what we have done here is collect it from a computer-ma-bob!  Simples!

The information supplied here is collected from the search requests that ebay get - Therefore they represent the items people are looking for the most - At least it allows you to configure your auction title with some really juicy keywords! (I DO NOT advocate using irrelavant keywords in your title or auction).

Thanks for your time, I hope I've been helpful!

SuperCooper

Right...  The categories and best sellers are as follows:-

CLOTHING, SHOES & ACCESSORIES

 1. Abercrombie  
   2. Citizens   
   3. Shoes 
   4. Prada 
   5. Bebe  
   6. Lacoste 
   7. Manolo Blahnik 
   8. Seven for All Mankind 
   9. Banana Republic 
 10. Nike