Apple's latest software for the iPhone - iPhone OS 3.0 - has added a wealth of new capabilities to the smartphone. Among them push notifications and MMS support.

So now most developers seem to be focused mainly on expanding existing apps to incorporate these capabilities. Here's a quick look at five applications that use these features.

The easiest way to track them down is by accessing the App Store on the iPhone and searching for the app title. (You can do it in iTunes, too, if you want.)

1. Push to jive: BeejiveIM 3.0 with Push

Price: £5.99
From: Beejive

Beejive was an early developer for the iPhone; it even had a web-based instant messaging client before Apple released the APIs for building 'real' iPhone apps. What's new in Version 3.0 is push notification, one of the premier new features enabled with the release of iPhone OS 3.0.

What this means is that BeejiveIM 3.0 will let you know whether any of your IM accounts - AIM, iChat, MSN, Yahoo, FacebookIM, ICQ or Jabber - has an incoming message, whether you're currently running BeejiveIM or not.

Though there are other (and free) IM clients, BeejiveIM has one of the more integrated user interfaces, as well as a wealth of options, such as SMS out, hyperlink support, chat histories, and pop-up-ad blocking.

Though some people might not want to be available this way 24/7, it's nice to know you can be. (Note to BlackBerry and Windows Mobile users: Beejive has you covered as well.)

2. Fight the flip: Flickit

Price: Free
From: Green Volcano Software

This app for mobile shooting and uploading to Flickr will surely benefit from the iPhone 3GS's new and improved 3Mp camera - and possibly from the additional onboard RAM and added storage space.

Flickit allows you to take, tag, title and geotag multiple photos for uploading to your Flickr page. I've managed to avoid the Flickr phenomenon, since I'm not a shutterbug, but I can see how this would be wicked useful for those who are.

Best of all, it's even compatible with all previous hardware models and iPhone OS 2.2 or later.

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