[Asphyx]

First thing I did was buy the largest SDCard I could find (8GB at the time) to install most of the software onto instead of the device memory.

The device memory is reserved only for programs that require being on the device and/or are programs useful to maintaining and troubleshooting the device itself. All my networking and utility apps are on the device...
But all the games, Navigation and Applications are installed on the card.

I would have to say S2U2 is a must have program. Make sure to enable Caller ID on it!

I also use Weather Panel which so far is the best weather app I have found.

SPB Phone Suite is also a handy little app. It allowed me to assign the Comm Manager button to something else since SPB PS has it's own comm manager in it.

PDANet is a must have for me only because I live in a rural area and many of my clients only have dialup access available. When I work on thier systems I can get high speed (EVDO RevA) speed on my laptop to download files they need installed. (Note you better have unlimited data if you plan on using this!)

I also highly suggest Resco Tools (Explorer and Registry editor most important) as it works slightly better for navigating the file system than Total Commander and has more capability that the stock File Explorer.