Lupin in our forums, of group JBG, has released a pack for playing Flash files on PSPs with v2.70 firmware, called the JBG Flash Pack.

Basically, most Flash sites viewable on the PSP are too resource heavy, and therefore the browser renders the site inaccessible. With this pack you can view any Flash file you save onto the PSP's memory stick and then launch it anytime you choose. All files are referenced using an easy text index.html file. Simply drag and drop the folder included in the download to the root of your memory stick and open up the web browser, enter file:/hs/index.html in the address bar (then bookmark it!).

Install notes:
Drag and drop included folder to the root of your memory stick.
Open up your PSPs 2.7 Web Browser and type:
file:/hs/index.html (Bookmark it for quick access later on)
And choose what you wish to view.
Once the Flash is over or you wish to watch something else simply press L to go back to the main page

Included are 14 Flash files, mostly animations, and it is planned for the next release to include more Flash games and animations along with enhanced HTML, instead of plain text.

Download [JBG Flash Pack v.001]