Now you can use up to 300 hundred catagories in total inside your store. 

Starting with up to 30 Catagories in the first level/tier.  What does this mean?  Even more opurtunity to get your product shown to the right person.  That is if you understand keyword density and how this comes into play in search engines. 

Anyway this is awsome, but only if you take advantage of it!

Please search for other guides on searh engine optimization, or ebay search engine, to get a full understanding of how powerfull this can be in promoting you ebay store and items within.

Hope this was insightful,

Nick