The iLife version that comes with all new Macs does not include iWeb or iDVD. If you want those, you'll need to buy the iLife 11 Box Set from the Apple Online Store. Or from an Apple Retail Store if they still have them. If you have another Mac with iWeb and iDVD, you can probably use Migration Assistant to copy them over to your new Mac.
Also worth mentioning: Apple has discontinued it's support of iWeb, so if you have a one-to-one account or otherwise make use of the genius bar - they may still help you for the time being (the staff is already trained . . . ), but officially, they've discontinued it (sadly, if you ask me).
It is now apparent that iWeb, and iDVD, will no longer be supported by Apple. This is evidenced by the fact that new Macs are shipping with iLife 11 installed but without iWeb and iDVD.
iWeb will still continue to work but without the following:
Features No Longer Available Once MobileMe is Discontinued:
◼ Password protection
◼ Blog and photo comments
◼ Blog search
◼ Hit counter
All of these issues can be solved with 3rd party options.
I found that if I published my site to a folder on my hard drive and then uploaded with a 3rd party FTP client subscriptions to slideshows and the RSS feed were broken. If I published directly from iWeb to the FPT server those two features continued to work correctly.
There's another problem and that's with iWeb's popup slideshows. Once the MMe servers are no longer online the popup slideshow buttons will not display their images.
Click to view full size
However, Roddy McKay and I have figured out a way to modify existing sites with those slideshows and iWeb itself so that those images will display as expected once MobileMe servers are gone. How to is described in this tutorial: #26 - How to Modify iWeb So Popup Slideshows Will Work After MobileMe is Discontinued.
Apple has announced that iLife is now an unsupported product and those iApps will only be available thru the App Store from now on. However, the boxed iLife 11 at the online Apple Store (Store button at the top of the page) and those still on the shelves of retailers will include iWeb and iDVD. Those two apps were listed in small, gray text on the iLife 11 box that I bought. Personally, if I already didn't have a copy I would purchase one to have it for reinstallation purposes if ever needed.