I received a GorillaPod SLR Zoom (heavy duty) for Christmas.
It needs a ball head to be of any real use. I'm surprised it doesn't come with one.
I just received a SLIK SBH-120 ball head from Adorama. It's light weight, sturdy and holds more weight than I'll put on it. It's black and a perfect visual match for the GorillaPod. It looks as if it was made for it.
Placing my XTi with a Sigma 17-70 on it was easy and it's as solid as steel in any position.

) but the concensus was that, while it might be useful in certain circumstances, it was very unlikely to be as truly steady (in terms of suppressing vibrations) as a tripod or proper camera clamp. Here's the link : 
