Here's a link to the teapot I use. I had one for a very long time just like it with a plastic filter, but when it broke I got this one with the metal insert from my local Borders using a discount coupon I'd gotten in email.

http://www.republicoftea.com/templates/detail.asp?navID=1770

But then, I make rather large pots of tea, have a cup hot in the morning then put the excess in a container in the fridge for iced later on.