The PSPWIki people have again done themselves proud, this version of the Homebrew Browser seems to hardcoded to just a few sites but in the irc chan efnet #pspemu we have discovered how to access many more sites in their Text version.
UPDATE
By changing the INI you can use bookmarks and visit other sites
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.