Sergey,
I have been playing with the ApexSQL Doc 2011 and it generates a .chm file. Have you used ApexSQL Doc and if yes, did you find this type of documentation useful? I am just thinking if it is worth buying their suite that includes both ApexSQL Diff and Doc.
"The creative process is nothing but a series of crises." Isaac Bashevis Singer
"My experience is that as soon as people are old enough to know better, they don't know anything at all." Oscar Wilde
"If a nation values anything more than freedom, it will lose its freedom; and the irony of it is that if it is comfort or money that it values more, it will lose that too." W.Somerset Maugham