to reinstall all the cabs that you normally use, try Sashimi. it installs to your memory card, and has folders in it for auto manual installs, which are then broken into cab, reg, xml, yadda yadda yadda. just drop your files into whatever catagory they fit in and away you go. I have mine setup so that once I re-flash, I run Shashimi and it installs all my programs and sets up my email account. now Im gonna figure out how to get it to automatically instal the registration info for Kinoma play and I wil be all set and fully automated.
