Hi. First off, I am thrilled with all of your newfound happiness with the Cybiko Computer. I have had mine for over a year now (when it was 109.95 for the classic!), and I can't think of a better purchase I could of made.
This device is EXTREMELY easy to develop for. It accepts C code, and it has it's own basic program, called CyBASIC. Also, by Greg of DevCybiko.com, there is a program called B2C. What it basically does is, one types in basic code, and saves it to a txt file, and runs it through the compiler, and makes it go at C speed, with the easiness of BASIC.
First to answer your question, CIM is a different type of messaging. It's not AIM. Its sorta like a Cybiko to Cybiko chatting over the internet. It is pretty flawed, and usually does not work.
At DevCybiko.com is MiaChat. MiaChat for cybiko is an AIM client, but requires a universal one-time 9.95 registration fee. But I believe that the first ten messages are free, or something like that. Also, from the same developer is something called QuinciChat, which is an ICQ client. This also requires the registration, but once you register one, all of his other programs are free.
Cybla.com is the longest lasting Cybiko site out there. It is mainly a news site, but recently has become a slight developing site.
Cybikohq.net is just another news site, with a couple developers.
4cybiko.com is a developing site.
CybikoCystems.com is my site. We mainly develop games, but have created some apps in the past, including a password protection app for cybiko. Currently we are developing a super mario bros. clone called SWB (super wannabe bros.), CyZelda, Final Fantasy, and pocket football. *plug* CybikoCystems.com !! You can also learn cybasic there, and see some examples of B2C code.
That's all I have to say for now. My AIM s/n is fluffy420420 and I can answer most if not all questions you have for cybiko, or developing cybiko... Also if you want, you can see the latest SWB demo by IM'ing me. (I need beta testers)