Update #3: Even more UMD Dumps surface (detailed below)... we'll post the related FileList.txt and Image Sizes from the releases as they become available. Thus far, only three exceed the capacity of the 1GB SanDisk Memory Stick Pro DUO many of us have, however, today the 2GB Pro DUO Memory Stick has officially been released. Stay tuned to this thread until then for further updates and enjoy!
Update #2: According to this IGN.com article, in addition to the voluntaryv1.52 PSP firmware update (see below) to fix the current security holes, future UMD titles will also include it built-in as a mandatory automatic update. The problem with this is it was bad enough new titles such as Space Invaders Pocket (JAP) already include a Version Checker that prompts you to update your firmware (from v1.00 in this case) in order to run the game, but now it appears $ony decided to include it on the UMD disc itself to alter one's firmware without consent during the normal course of a loading a new PSP game. Unfortunately, this nasty tactic gives educated PSP owners less of a reason to invest in new PSP titles.
Update: As a result of all the recent PSP developments, it appears $ony is attempting to combat them via firmware updates! Today Firmware Update v1.52 has been released which claims to add support for Music UMDs as well as fix some 'security' issues. As always, we recommend you do NOT upgrade your PSP yet... if you are wondering why just ask any PSP v1.00 owner.
Today more PSP UMD Dumps have been released as a result of the PSP UMD Dumper Utility being publically available. Titles are listed below, complete with filesizes and the FileList.txt generated from IsoBuster for each! Those interested can post all related feedback in THIS on-going Forum thread.