FastCGI tech preview 2 went out a long time ago. Since then there has been tons of excellent feedback in the FastCGI forums on http://forums.iis.net. Thank you!
Unfortunately it's going to be a while before there's another official tech preview / beta. In the mean time, I've attached bits that contain fixes for all issues reported to date. I must warn you: The attached update bits have not been as thoroughly tested as TP2, so you mileage may vary. Please report any issues you encounter to forums.iis.net and highlight that you're using unofficial update 70419.
In other good FastCGI news: FastCGI will be in Longhorn Server Beta 3! (not released yet)