UPDATE: Google has finished reviewing the site and has found it to be clean; they’ll be removing the warnings from the site’s search results. The hackers were able to insert new files onto the server and insert malicious code into WordPress that created a number of problems. I’ve deleted all the malicious files, and I also deleted all the WordPress files and replaced them with clean versions I downloaded this morning. So all systems are now go.
ORIGINAL POST: I’ll update this later, but this morning I discovered that the site had been hacked. I believe the problem has been fixed; I apologize for any inconvenience, and urge you to run any spyware/malware/virus scans you may have available to you.
More of an update later today, and hopefully I’ll fix the look of the site as well – getting rid of the hacked code also took out some of my customizations.