editing of last message on Skype

Skype (at least on my Mac) has a nice feature for editing my last message.

After sending a message I can press the up-arrow and Skype will pop up a dialog with my last message in it and allow me to edit it.

It also has a developer-centric way of editing using regular expression substitutions. Again, after sending a message like

se you at 10

you can type this as your next message to "fix" the typo:

s/se/see/

Kinda neat.