Update: I was unfortunately not aware of Shamus Young's severe criticism of Fallout 3 available here to link in the original piece and I regret that. It dovetails rather nicely with what I've written and it's much better executed than my piece. I strongly recommend anyone...
For better landings always catch your runner in mid-fall.
Magnets are useful, but not if you're not earning as much as you're collecting.
Fun thing is some of the power-ups work best in tandem so experiment and see what works with what.