My 10 favourite Apps (sequence is flexible):
1) Amazon Kindle (I have dozens of eBooks)
2) Audible (A bit buggy, but I love audio books)
3) Nokia Music+ (I stumbled over so much good music on it, plus it has a very good choice in Oriental music. Matches my JBL wonderfully. Heaven sent for license issue plagued Europe with no access to Pandora &co. Haven't tried XBox Music & Spotify yet, though.
4) Office/One Note (I use it for shopping lists, checklists and so on)
5) Whatsapp (very widespread in my circles, even a dumb phone using friend has it)
6) Wpcentral of course

7) Wparea (German language WP site)
8) Pocketpc (German language smartphone site)
9) Woman calendar
10) Rowi
There are more apps I like very much, I've listed the ones I use often.
Games I like at the moment: Farm frenzy 2, Bejewelled Live, Wordament
Things I would like to see:
- A ebookreader for epub format (I'm too deeply depending on kindle and would like to have other sources. Of course I can convert the kindle format with calibre, but its cumbersome)
- a debugged Audible app
- local newspaper apps (I live in Apple country, even Android users can feel left out here)