Is there a feed or otherwise centralized list of calls for proposals for technical conferences?
My answer to Is there a feed or otherwise centralized list of calls for proposals for technical conferences? on Quora
We have a crowdsourced index of calls for proposals from (mostly technical) conferences here: http://lanyrd.com/calls/—you can also subscribe to the RSS feed for individual topics, e.g. if you want to hear about PHP conference CFPs you can subscribe to the feed linked to from this page: http://lanyrd.com/topics/php/calls/