Twitter – next to feeds – is pretty much my source of information. I also use it to keep in touch with friends, sending direct messages, which only the desired recipient can read.

Unfortunately, I would need to check Twitter repeatedly to see whether or not I received a new message or @ reply. For Mac users, push notifications are already possible, using the Growl service, but I neither have a Mac (yet) nor would I like my computer to be running 24/7.

Boxcar is an app that finally solves this issue for me. Available on the iTunes store (for free), it will allow push notifications for the service(s) of your choice. The first service is for free, every other one is available via the in-app-purchase. Services available for push notifications are:

Twitter

Facebook

Email

What makes Boxcar special is the possibility to continue using the Twitter app of your choice. You can also read your news via Boxcar, but I prefer reading my messages with Tweetie. Other Twitter apps supported are:

Twitterrific

Twittelator

Twitterfon Lite

Twitterfon Pro

Twinkle

SimplyTweet

Twitterena+ Lite

Twitterena+ Pro

Birdfeed

Hahlo.com

The notifcations are pretty instant and for an app, that doesn’t cost anything, I would highly recommend trying this, if you would like to have Twitter push notifications or other services mentioned above. I’m using it only for my direct messages and @ replies, without the option to receive information about my timeline and I don’t see much reason to complain. :)