Enjoy the following programs, for free:
Find Any File is a tool to find files by name, date, size (not by content, however).
New version 1.4.2 released on Jan 4, 2010
See the Find Any File page for more information and download.
iBored, the Block Oriented Editor, is a tool to view and edit disk sectors and related files.
See the iBored page for more information and download.