To use the store simply visit this site in your PS3 Browser. When you find something you want make sure you have a USB storage device attached to your PS3. Click download and select the location to download to. Once back in the XMB you should be able to install the PKG without restarting the PS3.
12/31/12 - Thanks to aldostools, andreus.sebes, and STLcardsWS! They are helping maintain Brewology! If you want to help contact us on the forumsNote: - Please continue to use the Java based apps for things you can't find here.