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.