The last 7-10 days, my bookmarks (that show up here) have been about a week behind. My site was only showing up to Jan 13 or something, when I had bookmarks from Jan 18 or so. Over at my actual account everything was correct, but the API was lagging behind a few days. I contacted them to report the situation after day 2 of realizing this (and making sure nothing got updated and it was me who was behind), and they assured me that it was a known problem and would be fixed soon. It looks like it’s all back to normal now; which, for whatever reason, I’m glad about.
I use del.icio.us a lot more than I probably need to, but it’s so easy with the Firefox extension I hate to let anything remotely interesting slip away. That’s the reason I don’t just pull in all of my bookmarks for my site—they would flow through too fast and the really good ones would not have any priority, or last more than a day. So I tag the “golden nugget” bookmarks with ‘rpheath’ and pull in only those bookmarks. I feel like I get more control that way.