20100124 is out now, with various improvements to find in files.
There's a new field in the find in files panel, which can be used to limit the files searched. Multiple wild card patterns can be used by separating them by semicolons (e.g., ".h;.cpp"). Prefixing a wild card pattern with a minus will result in it being used as an exclusion, e.g., "*.txt;-readme.txt".
F4 will now either go to the next find result, or the next build error, depending on which panel was used last. Shift+F4 goes to the previous result.