I like the avrdude "fixer" wrapper -- but! I seem to have trouble with this and USBAsp (which may be because the USBAsp driver doesn't show up as a Com port). Running version 5.10 of avrdude directly from the command line is a work around (just copy and paste the verbose uploading command line info into a cmd.exe box works fine), but perhpas this is something that is not just affecting my setup (Win XP -- I haven't tried it yet on a later version of Windows).
Can you capture the command line when you use your USBAsp in the official Arduino, I can add a workaround in the next version.
I want to add options to easily copy things like "Hex" file path, and other minor stuff to make the experience even better, but I want to keep compatibility with everything you can do or expect from official IDE.
To capture the command line, open task manager, process tab, add the "command line" column to the details. Option 2 use "Process Explorer" and copy the details while you are uploading the files.
Anyway, I bought you a Pepsi. ;-) Well done.
Thanks for the Pepsi!

Too bad I can't add a nice workaround for Win8 x64

maybe I can add the test signature but I am pretty sure that's illegal.
I would hope that the arduino team are noticing this
and will include you on there team real soon,
amazing well done,
Nice you like it, but the purpose of this is not to bundle anything with the official one. I published all the code changes for everyones peace of mind.