Top Ten Cisco IOS Tips

I was digging into my old favorite entries and got to this old topic from James Boney the author of "Cisco IOS in a Nutshell". A great book for both Cisco newcomers and veterans. In the first part of the book some IOS and Router basics and configurations are explained and the second part is a command reference which I really like it.
Basic tips but not bad to take a look at:
O'Reilly Network: Top Ten Cisco IOS Tips