vBulletin.com (No 'g' in the name!!) is the official company website. Pre-Sales and Support on the standard vBulletin product is given there by support professionals.
Questions regarding the default products and license or the allowed use of the software should be asked there.
vBulletin 4.0 is the successor of the vBulletin 3.x series. It has just been released in public and many sites will currently still be using the older 3.x series.
vBulletin.org is the website where we discuss and release modifications and styles to take your vBulletin installation beyond the default functionality and look. Questions here are answered by other members.
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