Here are some sites that contain many categories of useful audio creation resources.
KvrAudioarrow-up-right contains loads of audio plugins, both free and commercial, and great community forums.
Vst Cafearrow-up-right is a blog about good, cheap, free stuff.
If you like game music and want MIDI files, there is a huge collection here: http://www.vgmusic.com/arrow-up-right
Over time some threads on the Forum also represent a useful resource. This one has a lot of interesting links found by LMMS users: Users-choicesarrow-up-right
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