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Live Experiments (that's Windows Live, vivisection is not practiced here)

All the things you can do with Windows Live API tools (aka Messenger Connect). In the table, the right-hand side provides demo's in different flavours dependent on your setup and requirements.

A good place to start is the getting started guide (v5.0) which explains a basic signin to grant your application permission to perform the actions in this table.

Quick demos

deep
links
V5.0 (start guide) V4.1 (start guide)
<wl:*> Widgets MC Javascript API Custom/REST
Authentication
Signin, create a signin button   demo, demodemodemo, demo2demo
Signed in state (retrieve and monitor)  demo
Is Live user? (detects before signin)  demo
Get my Profile (name, email, picture, etc...)  demodemo, demo2demodemo
Contacts/Friends
Get a list of my friends  demodemodemo 
Send Email to a friend   demo 
Send IM to a friend  demo  
Activities, Publish Status/Micro-Blogging
Get my Activities   demo 
Get friends Activities   demo 
Publish status messagedemo demodemodemo 
Publish a bookmark link   demo 
Publish a link to a video   demo 
Publish a link to a picture   demo 
Publish a comment to an article   demo  
Chat/IM
Public chat widget demodemodemo 
Bar widget  demodemo 
Calendar
View Calendar eventsdemo     
Post a Calendar event demo demo   
Photos
View Photos  demo  demo

Useful information and resources

ServiceDescription
Blog: Windows Live For Developers http://windowsteamblog.com/windows_live/b/developer/
Blog: Inside Windows Live http://windowsteamblog.com/windows_live/b/windowslive/
Dev: Windows Live Developer Center http://dev.live.com
Admin: Windows Live Developer Admin http://manage.dev.live.com
Showcase: Windows Live Showcase http://connectdemos.com

Mashups

Mashups of the Messenger Connect API, might be more your thing... here are some crackin' examples

MashupDescriptionVersion
Share via emailA form and an autocomplete contact picker which can be used to send emails5.0
Group chatHold multiple chats. Drag friends in for a group chat4.1
Friend MapPlots friends on a bing map4.1
Share via emailA form and an autocomplete contact picker which can be used to send emails4.1
Chat WidgetChat widget3.7