Instead of using a tripod, I use a Fuji S5 Pro. Can shoot high ISO (1600 to 3200) without much noise and if there is a bit of noise I clean it up with some noise reduction software like Noise Ninja or Nik Dfine.
If I am lucky, can take acceptably sharp (but of course not super sharp) pixs with my lens set at 300 mm as slow as 1/25 second. If not lucky or kan cheong (excited) then even 1/125 seconds or faster still have camera shake. With VR lens, I get "lucky" more often and can a higher rate of sharp pictures.
To me, this is more practical than carrying a tripod every where and by the time you set it up, the situation that you want to take may be gone. Tripod works only for things that don't move, eg scenery and buildings, or when you WANT them to move, ie to capture movement.
I have an essay on night photography without tripod published in JPG Magazine.
I also take a lot of concert / performance pixs, all without tripod. You can view some at my photo essay on On Stage Photography and my JPG essays on Wayang Topeng and other Esplanade performances, and also on my website.
This really boils down to how well the photographer plan and prepare prior to the shoot. I have never missed a shot because I had to set up the tripod.