Riak is a decentralized datastore from Basho Technologies.
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The simplest useful program that uses Erlang/OTP features I could think of. Website monitoring needs concurrency (Erlang) and reliability (OPT) . This OTP server monitors a list of sites and shows a heartbeat when all is well and a warning when one goes down. It's mean to be basic but email, twitter and lava lamp support may follow :)
Add an inline translation to a selected piece of text in Firefox. It works with Google and Bing translate but can work with any web translation service by changing the user preferences.
BossDB: a sharded, caching, pooling, evented ORM for Erlang
Zotonic - The Erlang Web Framework & CMS