Python (258 chars as is, including 66 chars for first line and 30 chars for punctuation removal) :
W="and is the as of to or in for by an be may has can its".split()
x=3;y=2;d={}
for l in open('c.txt') :
for w in l.lower().translate(None,',.;\'"!()[]{}').split() :
if w not in W: d[w]=d.get(w,0)+1
for w,n in d.items() :
if n>y and len(w)>x : print n,w
output :
4 code
3 keywords
3 languages
3 execution
3 each
3 language
4 expression
4 statements
3 variables
7 statement
5 function
4 operators
4 declarations
3 programming
4 which
3 such
3 types
