This tool returns the HTTP response code for a whole list of URLs, and includes which URL they are redirected to where pertinent.
You can optionally fetch each URL twice, with varying user agents and compare them. This can help turn up cloaking issues, such as those page redirecting for GoogleBot. Note: it only checks the response header and redirect location, not the page content.
Update April 2014:
Just enter the list of URLs below and press the button: