As per the blog I've finished a Winamp 5 guide which should be posted shortly & covers; Input & Output plugins in detail (MAD, Shibatch, ASIO, DirectSound SSRC, etc.) and other General preferences. So core/quality output options essentially for the moment although I'll be expanding in the next version. Post up any suggestions you've got for these additions here, e.g. DSPs worth covering (Perhaps even just a list of suggestions, similar to the Firefox extension listing).