See if there is a Group for the keyboard you are interested in on the Yahoo Groups.
Sonicstate has developed a large database of user reviews as well as reviewing recent gear releases.
Harmony Central also has a collection of user reviews and latest press releases.
See the Synth Zone BBS for synth related discussion.
For music shareware Shareware
Music Machine is a very good place to start for any platform, and the
Software Archive Sites page has plenty of links you can
check out. K-v-R supports open standard audio plugins
and is a great source of plugin information.
If you are using Windows then MIDI-OX is essential sysex software for sending and receiving patch data with your MIDI synthesizer. If you are using Mac OS X get SysEx Librarian.
If the website you desparately wish to find has disappeared you may be
able to visit an archived version of it in the past using the
Wayback Machine.
Synth
Zone is an attempt to ease the search for synthesizer & electronic music production resources on the
Internet.
For more info read the Synth
Zone FAQ.
Korg Kronos sets a new standard for electronic keyboards.
Alesis present StudioDock a universal docking station specifically designed for the iPad.
MIDI Mobilizer adds MIDI connectivity to iPad, iPhone and iPod Touch.
Band In A Box for iPhone extends the usefulness of BIAB desktop.
Jam2Jam is collaborative media performance software.
Sympheo is a CSound synthesis graphic interface oriented to music composition.
Totalmusik release the Metasonix S-1000 Polyphonic Wretch Machine sample library.
Korg SOS is a portable unlimited track recorder with effects.
Vogue Quattro is a free standalone synthesizer for Mac OS.
Wavosaur is a very useful free Windows sound editor supporting wav and mp3 files as well as VST.
Video2Mp3.net provides free conversion of YouTube videos to MP3.
KeyB is a digitally modelled B3 that is hard to pick from the real thing.
Music Notation for MS Word.
Ventura Epoch features electric pianos and Ventura's flexible organ model.
PowerFX present Big Al synthetic vocaloid software.
You Rock Guitar is both a game and MIDI controller.
Misa Digital Guitar is a very different type of MIDI controller still in development.
Keyboard Magazine interviews Paul Shaffer.
Make your own virtual instruments with Synthmaker.
Kurzweil release the PC3LE6 for the budget concious.
Zoom R16 is a 16 track digital recorder that doubles as a control surface with 8 XLR-1/4 inch inputs at a rock bottom price.
Janostman shows you how to build your own VA synth.
MiniOrgan.com is collection of musical toys from the 70s and 80s with pictures and soundbites.
Cantabile is a host for virtual music instruments and audio effects.