This is Buddy Wakefield's homepage on his website. It makes great usage of alignment by having his name in bold and center, while the picture below is also center. This creates unity between his name and his image. There is a left-flush type (separated by a line) that shows different area of the website and creates a clean, organized look.
This is the website of Mario Sanchez Nevado, and it uses a left-flush type as well as center type clear to the top of the page. This is to leave open space for a preview of some of his work, which is on a slideshow that cannot be seen in this screenshot.
When I ran out of places to look on the web for examples of good alignment, I went o facebook. A friend of mine, James K. Hamilton, is a graphic designer--graduated from Rio Grande and studying now in Athens. This is something that he did. I think it has an interesting use of alignment and unity. The heading is obvious, and the "Rock" is left-flush while the "Ensemble" is centered, so the piece is enticing.
This is also something I found through James, though I'm not sure if he is the one who created it. The heading is obvious and interesting, while the "when, where and why" are aligned with each other and the information is aligned together as well.
This is something I found on Alex Pardee's website. He is and artist I have had interest in since I was in high school There is unity in the piece, the Zero Friends Forever is separated from the background pieces. The background piece aren't necessarily aligned with each other but that draws focus to the main part of the piece.
This is an ad for a concert that a band I know (personally) played in. I feel that it doesn't make very good use of alignment, and it looks rather messy.
This is just a business cared that doesn't make very good use of alignment either, everything is scattered and nothing (expect the hubze:simplifying social.) is very unified.