This site has now moved from YUI grids to Blueprint.
The only reason to bother was mainly work-related, for practice. I don't really have anything bad to say about YUI grids, in fact I've grown to like it a lot. Equally, nothing bad to say about Blueprint, yet. 
Easy to understand and quite flexible.
There are some proprietary pages such as subaru/sparow, travel, rss madness and others that will stay YUI for now.
Archived comments
YUI
— AnonymousI tried both, YUI is better IMHO.
travel and rss madness pages
— f1vladtravel and rss madness pages are now on blueprint as well :) now subaru/sparow is remaining from the pages I care about.
HTML5
— f1vladHTML5 comes next, something I am very excited to dive into.