If you're looking to start learning Windows Phone 7.5 development, this could be the perfect place for you to start!  Jeff Blankenburg from Microsoft has compiled (or rather, at the time of publication of this post is compiling) a series of 31 tutorials on how to implement Windows Phone 7.5 Apps.

The tutorials are "snack-sized", meaning they won't take you three hours to go through and they have been laid out to provide you with a learning path to getting comfortable with Windows Phone 7.5 development so you can create awesome apps for Windows Phone.  Basically, Jeff is providing a new tutorial every day in the month of November (2011).  Below is a list of these tutorials:

Check them out and let me know what you think of them!