In bobsmiscellany.wordpress.com I am using the "White as Milk" theme.
I suddenly noticed that there were Page Templates in this theme. So I started playing around and tried out "Links" and "Archive".
Soon found out that these (maybe all Page Templates?) blow away your own content and your sidebar. So I tried to revert to the Default Template. But this time Save did not work. It insisted on keeping the last non-default saved. Something to be fixed sometime?
(I worked round this by saving the page as title "Search" and making a new "About" page.)