Which is the best format for a logo

Vector is always the safe way to go as most clients (not all) end up using them on other bits and bobs.. but if you know its purely for website use I think a very large JPG would be fine.

Remember photorealistic images JPG , flat cartoony images do well in .GIF

I vote vector. Why not better have a resizable logo?

logo convector is the best software to make a logo.

Vector formats are the best in my opinion as you can change the sieze
without affecting the quality

adobe photo shop cs3 or cs4 is good for logo design.

vector is my bet. if the job includes resizing images, then vector is your bet too.

Seems most sites require logos to be .jpg so I would go with that...

jpg format is best for picture logo and it easy to use in adobe photo shop software.

i use png because a lot of clients like having transparent backgrounds

vector (.ai,.eps)