Would anyone feel differently, I wonder: I find a lot of the feel for left-aligned web sites is connected with small, rectangular components. Much like a spreadsheet, that starts off in the top-left corner, and spreads out more strongly in a vertical/downward direction than horizontal/rightward direction. Moreso than small/rectangular elements, I'd expect left-aligned sites being much more text-heavy than colour or imagery based.
That's the feel on the front page of jenningsbet.com although much less on the front page of betfair.com.
Although in both those cases, there seems to be a bunch of subdomain sites linked and what I've checked, after one click on the front page, the design is centered. Bizarre.
Okay I just wanted to add: here are a couple examples after a minute searching:
An odd-one-out left-aligned with MUCH colour and image style, but it turns out obviously very well used, taking advantage of left-alignment.
A great second example of good left-aligned content.
Another beautiful left-aligned design, still full of small rectangular components (but oh-so-beautiful!)
It seems a common pattern between these three, and probably most GOOD left-alignment is a texture or other background image gradually flowing, unbounded beyond the right side of the screen.
Btw, I had to remove the anchors for the links because I'm new and not allowed including more than 2 urls.