Lens Rentals.com rents a variety of Canon and Nikon lenses and bodies with insurance and pre-paid FedEx shipping both ways.
I just rented the Canon EF 17-40 f4 L, the Canon EF 180mm f3.5 Macro, and the Canon ST-E2 Speedlight Transmitter (to control my flash off camera) for $179 for one week and that includes insurance and shipping both ways. Rather than have to make a trip to New York and try these things at B&H’s counter with a line of anxious people breathing down my back, this will allow me to really try the equipment out at home, take my time, and see if I want to buy later.
It looks like a great service. We’ll see how my first experience with them goes.
Update: I’ve used them numerous times over many years and their service is first rate. One of the best online services out there.