How do I add permanently to Pythons sys.path?

[cnb]

>>> sys.path
['C:\\Python25\\Progs\\NatLangProc', 'C:\\Python25\\Lib\\idlelib', 'C:\
\Windows\\system32\\python25.zip', 'C:\\Python25\\lib\\site-packages\
\orange', 'C:\\Python25\\lib\\site-packages\\orange\\OrangeWidgets',
'C:\\Python25\\lib\\site-packages\\orange\\OrangeCanvas', 'C:\
\Python25\\DLLs', 'C:\\Python25\\lib', 'C:\\Python25\\lib\\plat-win',
'C:\\Python25\\lib\\lib-tk', 'C:\\Python25', 'C:\\Python25\\lib\\site-
packages', 'C:\\Python25\\lib\\site-packages\\Numeric', 'C:\\Python25\
\lib\\site-packages\\PIL']
>>>

Now I have my personal programs in C:/Python25/Progs/

How do I add so that I can just do "import somefile" from anywhere in
that directory in the interpreter and it can load files from other
folders in that directory.