How can I carry a tripod on my bike? I have a tripod for my SLR camera that I want to carry on my bike. It's just a generic tripod like this one, but if I strap it to my top tube it rubs against my legs while riding (and it's slightly too long for that). 



I do have a pannier rack, but I haven't been able to attach it in a way I'm happy with yet. Do I have any other options?
Your best bet is to find a good way of attaching it to the rear rack.  Anything attached to the main triangle much larger than a bottle is likely to cause interference with your legs.

One way you could attach it to the rear rack would be to buy some pannier hardware and make your own pannier for it.  Or possibly attach the hardware (zip ties?) to one of the tripod's legs, making it into its own pannier?

The other option is to strap it down to the rack deck.  A nice sturdy rack like the Surly ones (archive) should give you plenty of stability, using a couple bungees to tie it down.  I've hauled 3 foot long loads on my rack this way without any trouble.