Re. the Freeware comment: LAME _does_ expire after 30 days, however, this is for licensing reasons. If you want to continue using MediaMonkey with MP3 encoding, you can just copy the standard version of LAME into the plugins directory.
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I've been a miranda user for the longest time but have found that it's a bit buggy. In comparison, GAIM is easy to install, doesn't require you to install 10 different plugins to get a basic working client, and is rock solid.