Simply download VISIONary from (edit: used to be in the Market) Modaco. I tried it on FRG83 stock. It works. No ADB, no external computer required, no fuss. Thanks to the developers!
EDIT again: Sorry, the FRG83D build no longer works with VISIONary - BUT - the overall rageagainstthecage method still works via ADB. I also hear that SuperOneClick works but it requires a Windows machine.
Ok it's been established that Universal Androot / exploid / freenexus no longer works on FRG33/FRG83 etc. And it's been established that "rageagainstthecage" does still work. So far I'm not aware of a one-click method to implement the latter exploit.
So I'm starting this thread to centralize everyone's experiences. I don't personally need these instructions but other folks apparently do. I've quoted a rooting guide in post #2. If you think any refinements are necessary or you have a better way of writing it out, please feel free to add to this thread.