Alarian - use the Megalight theme and turn off features (like font shadowing and lyrics and hit accuracy meter and in-game stars and stats) until it's playable... pretty much all the new stuff is optional.
evilynux - I tried
this patch to load the songlist in a synchronous manner. It did not completely stop the blackSOD when entering the songlist but it did seem to occur a lot less. It also prevents the loading screen from appearing when loading a song folder with a lot of songs. Overall, though, an improvement. I think the "synch = True" parameter should be the default for the game's loader function -- all the graphics files are loaded asynchronously in every scene. When I get another chance to test I'll experiment with that.
Also, for the new Rock Band 2 songs, cama's been packaging them with a song.ogg (without crowd singalong mixed in) and a song+crowd.ogg -- I wrote two quick functions in my old Career Resetter app that lets you select a folder to search through, and it mass enables / disables the mixed-in crowd singalongs (making backups of song.ogg where appropriate). If anyone's interested I can post it up.