There's a really tough one for getting your fingers stretched.

It's here:

http://guitartricks.com/lesson.php?input=1595

...but if you don't have full access it's basically this:



|---12-----16-----19------|

...on all six strings. (and yeah, it really is a stretch and hurts like crazy)
Work your way up, then work back down. Once you've done it for a few weeks try moving down by a couple of frets and stretch even further.