Google Latitude for iPhone
A good news for iPhone lovers: Google latitude is now available for their devices. With google latitude, you can view the current location of your friends and you can share the messages with them.
You’ll also find basic Search and Directions functionality to help you get around the world. And just like our Google Maps for mobile client apps, you can press the “blue dot” to be taken to your approximate current location on the map with My Location.

Purplera1n Tutorial to Jailbreak iPhone 3GS

Although Redsnow has been released by iPhone Dev team which is a popular tool to jailbreak your iPhone 3GS but Purplera1n is also an easy tool. It was giving some issues with Windows vista but now it is resolved.
Tutorial: How to Jailbreak iPhone 3GS OS 3.0 With Redsn0w 0.8

Quickpwn is a popular tool to jailbreak the iPhone and it has been using for earlier firmware version but with the latest release of firmware of iPhone 3GS OS 3.0, it seems very difficult to jailbreak the iPhone.
You can also use Purplera1n to jailbreak your iPhone 3GS easily.
For this purpose iPhone Development team has released the new version of Redsnow o.8 and now by using this version one can jailbreak the latest firmware easily. To unlock the iPhone it is necessary that you first jailbreak your iPhone.
Here is a step-by-step tutorial to jailbreak iPhone 3GS using RedSn0w for Windows and Mac users. As told that to unlock your iPhone you need that your iPhone is jailbreaked. After jailbreaking follow this guide to Unlock Your iPhone 3GS OS 3.0 With RedSn0w.
Download all versions of iTunes for Windows & Mac
If you want to jailbreak you iPhone or you want to unlock the iPhone, then these iTunes are required for this purpose. These iTunes are both for Mac and Windows mobiles and sometimes it is very difficult to get the direct and stable link to download the iTunes.
Here you can find the iTunes direct from apple server and their speed is very good as well.
Download iPhone Firmwares (Software)
If you are planning to unlock your iPhone firmware, you will need the firmware other than itunes. Click here to learn how to unlock your iPhone your Redsnow. Although a rapidshare link is given in the post, but here are other ways by which you can download the iPhone firmwares, also known as softwares.
Here are the direct download links of the iPhone 3.0 OS or the 3.0 Firmware .
iTunes is not able to have stable connection with the Apple server and so the download is being interrupted and stopped in the middle.
How to Unlock iPhone 3GS with Redsnow

Now you can unlock your iPhone with the new version of Redsnow, the multi-platform unlocking tool for the iPhone 2G and iPhone 3G, now also works with the iPhone 3GS.
An unlock tool for the iPhone 3GS has been much anticipated by Apple fans since its release and even though there was a tool named Purplerain to unlock the iPhone 3GS, the fact that it wasn’t backup up by the iPhone Dev Team didn’t bring relief to many hearts.
Tweetdeck: Twitter App for iPhone
Tweet on the go with all your favourite TweetDeck features on your iPhone.
TweetDeck is your mobile browser for staying in touch with what’s happening now on Twitter from your iPhone or iPod Touch. TweetDeck shows you everything you want to see at once, so you can stay organised and up to date no matter where you are.
Create groups, search Twitter, manage multiple accounts and easily post your tweets or share photos, link and much more. Plus sync your existing TweetDeck columns between your desktop and iPhone. Nice and easy.