Links:

Official Links

Official website of foobar 2000 There, you will be able to download the software itself
Guruboolez French guide, this site is for a big part a translation of this guide.
3rd party components: There, you will be able to download a lot of extra components given on this site
Hydrogen Audio Wiki As this guide is based on the community participation, don't hesitate to improve it
SH/SC Wiki : foobar2000 There is an awesome FAQ
UI forum with a lot of stuff for this component

must-know sites for fb2k, plugins, custom installers, strings, etc it's all in the title, before asking any question, visiting the links given is a "must-do"
Most Sought After Plugins, looking for a feature check here first all is in the title, before searching a component, go there
Foosion's site lot of help about the components he made
Music music website a lot of components downloadable (he made UI columns)
Kode54 website also a lot of components
Case pageComponents and special installer downloadable
Titleformat help For the people who want to use the tagz language
foobar galleryThere you will be able to show your foobar and admire the others one
Unofficial guide to the masstagger by picmixer Some help about the masstagger