Mail Forwarding from the US

Can anyone recommend a mail forwarding service from the US (or Canada)?
I only get a few bits and pieces a few times a year, but occasionally I reckon it would be cheaper to consilidate shipments - particularly when buying from places that only use DHL/FedEx.

I haven't used any of these but here are some companies that do it for you.

http://www.bongointernational.com.au/
http://www.forwardit.us/
http://www.shopanyamericanstore.com/

Cheers

Yogie