I've only been using mine for a little over a year. I do use it for music and podcasts, but I also use it as a PDA. I use Gene Cash's spend-it to balance my checbook; Expense Assistant to keep track of my pocket expenses; the GPE Suite for my calendar, to do list and address book. GPE can be synced with gcal and Exchange, so there's little reason not to use it. I work outside every day, so OMweather is essential. Yellow Notes and Quick Clip are great for making lists on the fly. Gnumeric is great for editing spreadsheets.

In fact, the only missing to make this perfect for me would be a dedicated Dropbox app, but since I can access it just fine through Opera I'm happy.