I had a horrible time with ActivePrint... probably because I don't have a Mac...
All I want is something that can talk to Windows standard network printing... I guess it doesn't quite exist yet. On WM it is so easy... JetCet for example works great, printing directly from my WM phone to any Windows network printer. Doesn't seem to be an equivalent in the iPhone/iPad world...
The next best thing might be apps that can talk IP/LPR. That's fine for printers that are directly on the network but not fine for those that are attached to a server...
Suggestions welcome... as long as they don't involve a Mac, nor emailing, nor too much nonsense on a PC (there really should be no need for anything on any particular computer -- the iPad should be smart enough to talk directly to *standard* print servers on the network...)