Should be a good fearure as long as it is easy to find the way to turn it off :-) Its a good feature for the people who are totally new to the interface. But when you learn how it works its not as helpfull.
These resources hav a tendency to anoy after you learn the mainparts.
How would it be if chess.com had a Tips Window - (a bit like pop-up ads). This feature could be enabled by default for new members, but could be switched off (or restarted) at any time.
It could offer snippets from the site Help, such as: why using books and DataBases during Turn-Based Chess is not cheating - and these could appear during posting in the Forums, during game play, etc. If they could be made relevant to the current activity, that would be fantastic (but virtually impossible!)
For example,
Did you know? The rules for playing TURN-BASED CHESS on this site...
#1. You many only have ONE Chess.com member account. #2. You may NOT get any help from any person or any chess engine throughout the course of a game, including tablebases. #3. You MAY use books, magazines, or other articles. #4. You may also use computer databases (including Chess.com's Game Explorer). #5. EXCEPTION: If both players agree for the use of a chess engine in an UNRATED game then it can be allowed.
For maximum impact, only ONE of these rules should be displayed at a time.