Happy 50th birthday to Dave Winer. He is one of the few people in our industry to say that he has changed the world with the work he has done. From being one of the co-authors of the SOAP 1.1 specification and the author of the XML-RPC specification to being a key evangelist of the power of weblogging and RSS, Dave's impact has been felt across the world.
Dave and I have had our differences in the past (and probably still do now) but there are few people who I can point to in the software industry whose existence has been as much of a net positive to us all.