I could finally fix the slow character I/O on SCPU, it's now above 30KB/s with CHRIN and 25KB/s with CHROUT, instead of the 11KB/s until now. I hope it'll still work on non 2.04 SuperCPUs. Also the XPCLink reading performance was improved a little bit.
There were no other changes, if you do not use SuperCPU or XPCLink then there's no point to upgrade from the previous release (20060604 0.90 patch 27).
Crossbow just surprised us with an improved ufli format, called mufli. The original editor could load and save to IDE64, I've just fixed the directory listing (which was serial bus specific) and removed the hardcoded device number, so no CHANGE command is needed.