First of all, check the developer forum for developer info =) But this is a good forum to find out what people want.

I'm going to encourage you to contribute to an open source project if possible, there are many:

MidpSSH (MidpSSH | SSH and Telnet client for Mobile devices (MIDP/J2ME))
JMirc (jmIrc - Java mobile IRC-client (J2ME))

These use J2ME (Java for mobile devices) and is compatible not only with the Blackberry, but with other phones as well.

The RIM Blackberry JDE (up to version 4.2) can help you in this regard.