If you're looking for a program that gives you the status of your storage and on board memory, battery status to include your backup battery as well as a nice icon based program launcher with a built in task switcher that also lets you use a windows like start menu and helps you mange your Today backgrounds, then try Pocketfacelift. Go here for the program and some add ons:
PocketFaceLift at Handango
Now, if Agenda doesn't get you up and going, then try Pocket Informant. Both programs are great programs, I just happen to like Pocket Informant. You'll also find many many folks who like Agenda. Best advice is to try both and see which one you like.