Kelly Hodgkins reports:
An astute reader stumbled upon an interesting bug with the HTC Incredible. The Incredible, with Sense UI, will periodically store screenshots of the contents of your web browser. The screen captures are a function of the HTC Sense UI bookmark widget and are not the main issue; temporary screen grabs are understandable. The problem is these JPEG files are extremely hard to get rid of. They remain when the current browser session is closed, they remain after you clear the browser history, and they remain after a full factory reset.
Read more on BoyGeniusReport.
In a follow-up report, they note that HTC has duplicated the problem and that there is a temporary fix.
Thanks to the reader who submitted these links.