As you know Apple has released latest version of iPhone OS which is iPhone OS 3.0. There are many new 
great features in OS 3.0.
You can upgrade iPhone OS 3.0 directly from your iPhone but if you don’t want to upgrade the OS from your mobile and need to download OS 3.0 on your computer or iPhone then there is no direct download link on Apple iPhone site. We will provide you direct download link to iPhone OS 3.0 from there you can download OS 3.0 and upgrade it whenever you want.
As there are many new features in iPhone OS 3.0 some of them are:
Cut, Copy & Paste
Landscape Keyboard
MMS
Spotlight Search
Voice Memos
Improved Calendar
Buy Movies, TV Shows, and Audiobooks
Enhanced Stocks App
Download iPhone OS 3.0 with these direct download links
iPhone
iPhone OS 3.0
iPhone 3G OS 3.0
iPhone 3GS
[...] Direct Download Link for iPhone OS 3.0 by CodeFear [...]