Who uses these?

Where do you use them, on your phone, PC, or both?

Why do you like them?

I use all 3, Pownce pretty much on desktops due to the file-sharing aspect.  Twitter I use via SMS and GTalk on my Blackjack and desktops, Jaiku get the m. treatment on my Blackjack, then the main web client on desktops.

 I love them because they have the potential of supercedeing IRC as a group medium, plus they are getting so extensable.

Ashamed to say i have not heard of any of these, checking them out now.

Still, there's something nice about IRC. its one of the best performing cross-platform apps (Even though it is fairly basic, so this isnt hard). Theres just something nice about it.  

Edit: wmIRC is always on my devices.  I like how i can still be an IRCop on my device when im on the train, all the commands are there etc.  

I love wmIRC, but these services are more extensable.  They can be used on mobiles, desktops, SMS.  There are tons of apps that mashup these services.

 I'll have to check them out. 

Where to start?! 

Start with Twitter...it's the best known in the tech community.

 I use Twitter and Jaiku.

 Twitter in Norwegian and Jaiku in English.

I prefer Jaiku, it's got better threading, RSS import functionality, groups, and a sexier look.

 ...but most of my friends that use a microblog, use Twitter... so I use both.

 I use them from my mobile mostly, (not SMS, the m.url stuff) and on the desktop I mostly use the IM-bot's through GTalk.

I have an Pownce account, but no friends there, and there are all these annoying spambots that keep sending friend requests, so I've mostly forgotten abouth it. 

I use TinyTwitter all day, every day!

wouldn't be without it ;)

Welcome Offbeatmammal - thanks for the link to TinyTwitter.

Recently i found a new software called TwitToday ! this is the greatest Twitter app for Windows Mobile ever, its more like today plugin since it place a text field at your today screen and gives you the ability to post your twits directly with just one tap, plus that its just 20kb !

download TwitToday 

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of course there are some other Twitter clients made for Windows Mobile arround,

i will start with ceTwit which is a little more advanced and shows your twitter history:

download ceTwit v1.3 

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 Another one i've tried is HelloTwitFace, it's similar to the ceTwit but it also has Facebook interface and HelloTxt

 download HelloTwitFace v2.0

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I personaly use a solution called Ping.fm which post my message to Twitter, Jaiku and Facebook at one time by just one click !

To test it please visit http://www.ping.fm

the mobile interface is available at http://ping.fm/m

Best Regards 

I thought about using Twitter, but then I noticed Facebook has the ability to display your status which you can change by SMS, Email, or just by logging on to the mobile Facebook on your mobile.

Anybody using Twitter might be interested in this article from Engadget about Twitter being able to control the house lights

 Ahmed, I use Facebook SMS as well, but I have Twitter integrated into Facebook, so when I Twitter, it automatically changes my Facebook status as well.