No, my LiveJournal hasn't been hacked. All of the short entries with "del.icio.us/zheaton" in the names are being mirrored from
my account at del.icio.us, which is a bookmark sharing system. I've started using del.icio.us to add a "sidebar" of my recent reading to my weblog, and decided to mirror that sidebar here. The sudden burst of posts was caused by me getting this mirror up to date - posts should come at a much slower rate in the future.
In general, each of the del.icio.us posts will feature one link, with a short description of the link. To view whatever I've linked to, click "Permanent link to this entry" - that will take you to whatever page I've mentioned.
I'm doing this as a counterpart to the dearth of writing I do - starting now, this journal should consist of a fair number of quick links to interesting pieces interspersed with a few major essays. If nothing else, that will make this LJ update more than once a month.