I have developed a PlayStation Store clone for homebrew games, media, and applications using PGE Lua that is signed(props to everyone involved in figuring out the signing at http://wololo.net/talk/viewtopic.php?f=5&t=1381) to work on official firmware PSP units. This allows users to simply install this application on an OFW PSP and use it like the PS Store to get the rest of their homebrew content, no PC required.
It goes by the simple name of HomebrewStore and can be installed by navigating the PSP browser to http://bit.ly/hbstore and clicking download.
There is not an abundance of content yet due to how new the signing process is(and I can only work so fast) but I have added some of the signed games and applications that I have seen already(If you see your content on the store and for any reason don't want it there I'll gladly remove it).
The HomebrewStore also has a built in update process for modifications to the client.
If you would like to submit your own homebrew content for adding to the store there is a submit form at http://hbstore.screeze.com/submit
There is also a video showing the install process and operation of the store at http://www.youtube.com/watch?v=Ke_DFzO27kc
Hopefully that covers everything and at least one person finds this useful