You should use pastebin.com to store your programs. Loading the programs in MC is as simple as:
Code:
pastebin get pastebincode programname
Here is an example of one of my codes:
The url to the code is:
http://pastebin.com/rjfa4ymR
To load this program ingame all I would have to do then is:
Code:
pastebin get rjfa4ymR energymonitor
The program is then stored on the computer/turtle as "energymonitor" ready to use.
Pastebin even offer LUA highlighting, but only after you save the code. But it is good enough that I actually just program my stuff directly on pastebin.