Nice work!

On playing around with the API I found that you can use the 'publisher' parameter rather than the 'q' parameter to get all your own apps. This will stop other publishers' apps being shown in the results if you have common words in your publisher name.

Obviously you can also change the country tag to get ratings and prices, etc, for the market the user is in.

For example, all my apps with ratings for New Zealand: http://catalog.zune.net/v3.2/en-NZ/apps?publisher=Sheerwater&clientType=WinMobile%207.1&store=zest