I'm giving Sublime a whirl and I must say I'm impressed, but I've noticed there doesn't currently seem to be support for replacing Notepad on Windows using the "debugger trick", which is a bit of a shame. Rather than just come on and bitch about it though I've knocked up a small launcher that handles this, along with a BAT file for making the relevant changes to the registry - seems to do the job for me (I've only tested it with the Alpha though).
If anyone else is interested in doing this you can grab the binaries (or the horrible C source code) from GitHub:
github.com/grumpydev/Sublime-No ... eplacement
Home someone finds this useful.