I created a new digest with the same feed just to confirm my suspicions of that it might be something in my latest entry doing this, and I got the following from this digest ID: JRM8HKFIHM
Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-pr..
I just deleted that post and reposted it on my blog, so we'll see if it works now. No idea where the above comes from.