I recently got the Telerik controls for Windows Phone (free in a deal for MS employees) and plan to use that to improve my Pax app - specifically I need the jumplist to replace the third party implementation I have now, which doesn't work for a 7.1 app. Before going in to replace everything in my Pax app, I thought I'd create a new app to get used to working with them.
I have vague aspirations of doing a little more concentrated data structures and algorithms revision this year, and working on my french/icelandic, so I thought I could build myself a flashcard app. I used one of the Telerik default app options, which was nice and clean. I found the couple of controls I added quite simple to use: the basic info is all easily available at http://www.telerik.com/products/windows-phone/overview/all-controls.aspx, but I'd love that page to contain the dll each control is in, rather than looking through the 6 options. Or ideally to link to a page for each control with the full docs for it (I'm sure I found full docs, but I've forgotten where - I mostly worked by looking controls up in the Object Browser in VS).
The first version of the app is super basic: one set of cards, can add/delete only, can move through sequentially or randomly. No option to enter the answer to keep yourself honest, no option to edit cards. What took the most time was creating the icon, which is still totally crap - all Paint no talent. Overall it took me two evenings, (probably about 8 hours) to get a working minimal version ready to submit to the app store. I didn't actually write any tests, which is bad. But it was pretty satisfying to get that done.