I think that it can be useful that the forum can advice sections/sub-sections/threads to newbies/guests just after the registration, by checking their IP.
Example:
=snip=
- If the IP comes from a country where Bitcoin has been declared ILLEGAL, than the forum will advise the user to look at a thread with all the legal informations about this problem.
These advices should be NOT annoying obviously.
+1. However, I suppose that Local boards should be the one most useful to post
BTC-specific legal advisories to users since local members are probably the best informed about their own country applicable laws. Main board could be used for English language countries, however.