Ping.fm:Update All Your Social Networks at Once
Ping.fm is a simple and FREE service that makes updating your social networks a snap.Ping.fm is a free social networking and micro-blogging web service that enables users to post to multiple social networks simultaneously.

Making an update on Ping.fm pushes the update to a number of different social websites at once. This allows individuals using multiple social networks to update their status only once, without having to update it in all their social media individually. Ping.fm groups services into three categories – status updates, blogs, and micro-blogs – and updates can be sent to each group separately.
Link:Ping.fm
IsFollow:Find Who is Following Whom on Twitter
IsFollow is a Twitter app to help you quickly and easily find out who is following who without having to login and scroll through 'following' result pages.

Find out if someone is following you, who your friends are following, what celebrities are following other celebrities (ex/ @petewentz follows @Seth_Rogen), if all your business related twitter pages are following each other to maximize cross promotion, if your competition is following you, or if you are following your competition.
Link:IsFollow
Posty:Update Status Message on Multiple Microblogging Services
There are many microblogging services out there. Sometimes you feel you have a “message” to send or a question to ask. If you subscribed many services, one of the first questions arising is: where do I post this? Twitter? Jaiku? Tumblr? Friendfeed? all of them? For each service usually you have to open the browser, login, write message, click post.

Although some cut and paste can save you some time, the task can get boring soon. Posty simplifies your microblogging. All you have to do is writing the message and clicking a button. Posty, an award winning application, will automatically deliver your message to the services you selected.
Features:
- browsing of personal, public and friends’ timeline
- posting of replies (Twitter, Friendfeed, Identi.ca)
- browsing and posting of direct messages (Twitter and Identi.ca)
- support to favorites (Twitter and Identi.ca)
- search of past messages (Twitter and Friendfeed)
- automatic, as-you-type, spellchecking of messages
- built-in url shortening service
- configurable notification of recently posted messages (Twitter)
- automatic notification and installation of new versions
- visualization of multimedia items (Youtube and Vimeo videos, Tumblr audio, Flickr/Zoomr/Smugmug galleries)
- automatic management of internet connection (works behind proxies).
Currently supported networks are Twitter, Jaiku, Tumblr, Friendfeed and Identi.ca.
Posty is an Adobe Air application which runs on Windows (2000/XP/Vista), MacOsx (10.4.9 or more) and Linux.
To run Posty you need to download the Adobe Air installer.