UPDATE
By changing the INI you can use bookmarks and visit other sites

HOMEBREW BROWSING HERE WE COME

Download the browser below (click the comments)
More to Come
Heres a video of the browser by Alcahest in IRC
http://psp-news.dcemu.co.uk/files/Browser2CHpsp.avi (link may change do not direct link to it)
A little tutorial by Alcahest:
how to use :
create a "2ch_browser" folder at the root of the MS
Place the bookmark.ini inside it
make sure to put the PBP is PSP\GAME\2ch_browser\
Launch the PBP
Press Triangle, select the bottom option, press circle to go back to the connection screen
press circle to connect
select the URL you want to go to, press Circle to access it.