There's many ways to get IP-Relay on a BlackBerry, either by adding "HipRelay"/"SipRelay"/"My IP Relay" AIM buddies to your AIM chat. These are relay operators standing by over the AIM chat network. Just install VeriChat or another 3rd party program.
For realtime keypress-at-a-time, use a telnet client to access
telnet://wireless.ip-relay.com:2510 ... I use Idokorro MobileSSH for this.
Yes, please look through this:
http://www.blackberryforums.com/showthread.php?t=795
(Thanks jbairdjr!)
And my "BerryFAQ" link below: