On August 30, 2005 Winamp 5.1 Beta 3 was available on the Winamp servers for download. It was just an accident though unexpected.
So far I know, the link was http://download.nullsoft.com/winamp/client/winamp51_pro.exe [No more available].
So, it was not clear to us that it was a beta release.
Later on CraigF, an Administrator, declared on Winamp forum that they had removed the file. He admitted that it was an accident and also declared that it would remain unsupported as it was in beta. According to him full release of Winamp 5.1 would take place very soon.
Anyway so far I know about the features included in Winamp 5.1 Pro is just like this:
- Play Music and Video Files
- Full Featured Media Library
- Integrated Internet Radio & TV
- Supports Modem and Classic Skins
- Tripped Out Visualizations
- Rip/Encode Music into MP3
- Burn CDs up to 48x
Changes in Winamp 5.1 Surround Edition:
New: CodingTechnologies AACPlus encoder
New: Grand Prize Winner of the Internet Surround Music Project
New: SHOUTcast Wire - A Media RSS Browser and Subscription Service
New: Predixis Smart Playlist Generator
New: AOL Radio featuring (((XM))) Free Sampler
New: CD Ripping now available at 8x in free version!
New: Microsoft WMA encoder
New: Over 200 new Milkdrop presets
Update: in_vorbis now returns bitrate in getextendedfileinfo
Fixed: WMA stuttery playback
Fixed: out_ds copy button on status tab now works all the time
Fixed: Much improved ripping and playback with Sonic engine
Fixed: Video window now resizable regardless of Sidecar
Fixed: Length of long mp3's now reported properly
Fixed: Silent install switch now works properly
Fixed: Simultaneous CD Playback and Ripping
• The Full version plays MP3s, AAC, WMA, and more; Compatible with Winamp 2 Plug-ins; Full Support for classic and modern skins; Plays Videos; has a Powerful Media Library; Browse Internet Radio & TV Stations; Integrated Internet Music Videos & Songs; Bundled Visualizations; and Burn & Rip CDs.
• The LITE version plays MP3s, AAC, WMA, and more. It is compatible with Winamp 2 Plug-ins and has full support for classic skins.
So, for all these we have to wait for its full release.