The conferences do have different focuses, but these days you will normally find something on most subjects at any of the conferences.
Teched (which is running now, at the time I write this post) - this one is normally quite heavy on IT, but with some interesting dev pieces in there
- This year's sessions - http://channel9.msdn.com/Events/TechEd/NorthAmerica/2012
- Archive back to 2008 - http://channel9.msdn.com/Events/TechEd
The Professional Developer Conference (PDC) - the key's in the name - for devs mainly, was the forerunner to Build - Archives from 1991 to 2010 are at http://channel9.msdn.com/Events/PDC
MIX - mainly for designers tho with some dev in there aswell - archives from 2006 to 2011 are at http://channel9.msdn.com/Events/MIX
These are all worth a look through - there are 1000s of hours of the best insight to working with the MS platforms you could possibly hope for.