ipkg install /tmp/foo_*.ipkThen, check that you have installed all the packages it depends on:
ipkg info fooThis will give you full details.
The web site for Qtopia .ipk files is: http://qpe.sourceforge.net/packages/ipaq/. Detailed descriptions of the packages are in the Packages file.
reboot
If you want to use the Terminal, you should probably install the bash package, since the Terminal and ash don't seem to like each other.