When you move to a new country, you'll probably want to make some local friends. However, you may well also want to make friends with some other expats, both from your own country or others. Partly that will be to get some support and advice on being an expat in the city (beyond what this site can offer!), partly to have friends in a similar situation to you, and partly it could just be to find others new+friendless in a new place!
Presumably, once you know a few expats somewhere, they'll be able to tell you about other expat events, where expats tend to hang out, mailing lists or forums or something like that. However, until you've managed to meet a few, it can be hard to bootstrap into the community.
So, as a new arrival in a new town, how do you go about finding and meeting other expats there?
(Note that this is an expat-specific version of the related Travel.SE question on Meeting other people while traveling)