My Atom Feed is invalid?

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I am getting the following message, when you click on the "Validate My Atom Feed" button (under the XML button on the right).

Sorry
This feed does not validate.
line 49, column 7148: Invalid HTML: malformed start tag [help]
... >Last Update <br />July 5, 2005 < /content >
^

It relates to my blog entry titled "HART's BOOKMARKS - Website Resources" ... so until I figure out what's going on, I will not bother posting my other links.

If you know what's going on .. can you please let me know?

Thanks.
HART