I have uploaded an optiLoader4_4.zip sketch to Google Docs.
OptiLoader is a superset of the earlier optifix sketch. Like optifix, it provides zero or one-button reprogramming of an Uno bootloader with the latest optiboot (4.4 in this case) while bypassing any auto-reset issues. In addition, it automatically detects chip type and will program an appropriate optiboot into ATmega168 and ATmega8 as well.
Documentation is a bit slim at the moment, but there isn't much too it. Wire as described in the ArduinoISP documentation, and run the sketch. It's designed to re-run via the reset button, to easily program multiple Arduino clones. Run a serial monitor at 19200 if you want to see what it's doing. If you put optiboot on mega8 or mega168 chips, you'll also need to have an updated boards.txt...
I've also uploaded fusebytes.zip, which pretty-prints assorted "deep" information about your Arduino. Including the optiboot version number if present and readable.