Amsterdam Stun is a newspaper for UK ex-pats. It's a useful source of up-to-date event info in English.
www.amsterdamstun.com

Europe for Visitors with Durant Imboden is a general tourist guide.
It's a big site so you may wish to jump straight to the Amsterdam or drugs page.
europeforvisitors.com

World 66 is similar to Europe for Visitors. It also has Amsterdam and drugs pages.
www.world66.com

Amsterdam XXX The Walletjes is a guide to Amsterdam's Red Light District.
http://www.ignatzmice.com/

These two might be useful if you're considering moving to the Netherlands from elsewhere in the world (see also FAQ).

ACCESS stands for the Administrative Committee to Co-ordinate English-Speaking Services.
www.access-nl.org