Anyone know any links to decent ms-dos sites. I know only small bits of ms-dos and would like to learn more but dos books are too exspensive.

Why would you wanna learn Ms-Dos? Windows dosent user it no more, and linux never had it. So? :) Anyways, try this site
http://www.csulb.edu/~murdock/dosindex.html

It's just something i'd like to know and have in my arsenal when i go for jobs. I know it's not used much but fills up the c.v