You're out on the road, but you want to be in touch with what's going on back at home or in the office. You know the email is piling up, but you don't want to grab all those messages just yet, since you know a fair percentage of them will be from some Nigerian prince or some guy who's willing to let you in on the latest magical fruit juice drink that will make you healthy, wealthy, and wise (perhaps wise enough not to fall for their scam?). Basically you want to check the mail, but I don't want to read the mail.
Vallen POP3 Mail Checker is a tool that lets you preview email in your POP3 email accounts. It's probably going to be most useful in situations where you're stuck with a low-bandwidth connection—like visiting Mom, where you know there's no broadband—or where you want to see what's going on but don't want to take up the space required for downloading messages onto your laptop or phone. You can also use this tool to kill spam on the server, rather than waiting for it to download and go through your email client's filters.
A Windows application, Vallen POP3 Mail Checker should be happy as an electronic clam on systems running Win98 or later.