NeXpose, WarVOX and a few things.
NeXpose and WarVOX under the Metasploit project would be worthy tools to integrate into Backtrack.
NeXpose under the Community project is open under Rapid7, so it would only require that each person sign up for their Community copy to get a key.
And while it's on my mind, considering that the new Backtrack is composed of an Ubuntu kernel, if that could be updated through the Remote Exploit repositories, or directly linked to let's say, the Karmic repositories so that we can have kernel updates as they come along.
Some seamless integration for NVIDIA drivers and CUDA have been in progress, but making the install painless in the repositories would be excellent.