Cherry Trojan, I think, is some slang that developed for the piece that forced mynokia subscription upon PR1.2 update.

That's the best I could come up with through power search of this forum.

Edit:

Here's the thread, on the page where I got the info to make the above conclusion:

http://talk.maemo.org/showthread.php?t=57214&page=13

There's something about a .cherry_state file, and just in general rambling about the MyNokia subscription thing.