I've run into some folks who say they don't have the SR4A rules, so here they are!  http://shadowrun4.com/resources/sr4a/sr4a_changes.pdf

I hope people will get to know them, most of the changes are really awesome.  Also, I nerfed my own character because of these rules -- she originally had a whole pile of skillsofts and could do even more stuff, but I had to rechargen once I learned that skillsofts were changed to cost rating x 10,000...  Which is a great fix for the cheesiness of skillsofts, really, even if it was annoying.

Among the highlights of the SR4A changes are:

Putting a cap on bow strength

Making skills cost less karma

Fixing flechette ammo so the changes apply to shotguns and grenades as well as bullets

Limiting device upgrades to +2, so there's no longer an incentive to buy a Meta Link and trick it out to hell.