This plugin will add your Media Library an explorer-like filebrowser feature, it recognizes hard drives, audio and mp3 (data) disks, removable drives (memory cards, pendrives, and most of mp3 players), and network drives. Now it's able to open and edit m3u playlists too. The plugin allows you to add named and timed positions to your songs (e.g. long mixes), the playback will start from that time. You can also map folders (e.g. your music folder) and playlists (add their shortcuts to the ML list). Files and folders can be copied/moved by drag&dropping them. The plugin is fully customizable, and will match Winamp's skin. For more information and screenshots check out http://mlplugin.try.hu
The Ultimate Media Library Plugin is the tool you need for exploring your folders with Winamp. Another cool feature are positions for quick bookmarking of songpositions instead of seeking manually.