In Vim, what is the best way to select, delete, or comment out large portions of multi-screen text?

Question

Selecting a large amount of text that extends over many screens in an IDE like Eclipse is fairly easy since you can use the mouse, but what is the best way to e.g. select and de

Answer 1

First answer is currently not quite right? To comment out selection press ':' and type command :'<,'>s/^/# /g

('<, '> - will be there automatically)