I want to download the iPhone SDK, but 2.7 GB is too big to download at once, so I would like to download it in parts?
Is there a link available to download the whole SDK in chunks?
Your best bet is just to download from the original link and just use a download manager that supports pause / resume.
Wil is right, your best bet is to use a download manager. The one I use is called Leech (it's not free, but it has a trial)
Safari directly supports pause/resume download for direct download.
Otherwise, you can find maybe what you want in a torrent download.