again rather a solution than a question:
Sometimes 3 uarts aren't enough, and you wish to have more different input channels.
But delaying for the baud rate? No way, processor cycles are precious.
Using a timer and a pin interrupt my software serial is able to operate at baud rates up to 115200 baud securely, without blocking other stuff.
latter post is completing my software serial sender which was described and largely dicussed here:
http://forums.leaflabs.com/topic.php?id=1166#post-7175
enjoy it