What do these help out with?

Alright I'll admit that I'm pretty non-mechanical when it comes to suspension parts on cars. Anyway could you guys tell me what these parts will help me with, besides wheel hop? They are Lakewood Brand Rear Lower Control Bars and Lakewood Adj. Panhard Rod.
http://store.summitracing.com/default.asp?target=/egnsearch.asp&N=400272
http://store.summitracing.com/default.asp?target=/egnsearch.asp&N=400272
Thanks!

A tubular panhard rod will improve cornering by minimizing flex of the panhard bar that causes the body to shift relative to the axle. Do a search on lower control arm "bushings". There are poly, sperical bearing and rubber mounts. Poly on both ends of the arm can cause your rear to bind in corners; I went with a combination poly/sperical bearing.

LCAs and a PHR will definitely stiffen the rear of the car up quite a bit. I went with the Spohn units with poly/poly ends. The poly ends like to squeek and groan at times, but I can live with it.