There is a glitch in the Blog software - when you save a blog entry, you will get a cryptic SQL error.
Do not worry though, your entry HAS been saved correctly..
I'm trying to fix this, will let you know once it's been killed.
In the mean time, please save your blog entries on your hard drive or something before submitting them, so there's no risk they will be lost. On all tests so far though, everything was saved correctly, it's just that we get that error message after doing so.
Stay tuned..