Interesting article on how to homebrew your own 2 meter duplexer... these guys prove that the amateur radio spirit of "if you can't find it, make it" is still alive and well!
New:
How to Modify a Sinclair Q2220E 132-174 MHz Duplexer to 220 MHz by David Cameron - VE7LTD
Also... these guys are nuts - and converting a Micor repeater to 220 Mhz use. Neat...