I don't use any of those, and I've used my Treo since January.
I have used the keyshades hack to keep the keyboard lights off. Something with that function should have been supplied with the Treo.
NiceGPSuperior1 is a free GPS program, now with the ability to save your map! Get more info here. It's free! If you like this app and want to encourage development, you can donate from the web page link.
NiceDrudgeReader is a fast, simple reader for The Drudge Report. It is only $0.99, so check it out, too! More info here.
Search for "Nice" in the app catalog to see all my apps.