I've spoken at a number of conferences over the years, however it has been more by accident than design. For those who are interested in speaking at a conference, a key starting point are the "calls for (participation or papers)" or CFPs which are occasionally broadcast on the web. Finding out about these is sometimes tricky, as there doesn't seem to be any canonical source for CFPs.
Now I'm not starting that canonical source (I'm hoping a friend of mine is going to do this) but in the meantime I thought I'd keep a list of current CFPs in the wild.
If you know of any other CFP which should be on the list, please tell me. Thx.