Add the ability to automatically decompress files to search for text in them
Search inside tar files?

multithreading

add a toggle button so that you can turn off printing the filename on
successful completion of a shell command -- do we really need this?

Find out what the deal is with the major and minor macros:
Are they supposed to be in sys/types.h, or are they in sys/sysmacros.h, or
does it vary (yuck). -- this doesn't seem to be an issue.

match a file by its magic number, like file(1) -- this is really too heinous

regexp matching, we can probably get a library to do this

GNOME compliance

spinner!

speed could be improved

use another toolkit, eg Motif(?) or Qt...

have each search make a different results window