Just keep track of the last time a user visited the application. any article with a date after that date can be listed as a new article.
Since this has pretty glaring weaknesses, I've never actually used this method, but I thought I'd mention it.
JGG
__________/ Taz \__________
I'd probably try storing the IDs of the viewed messages as a list in the client cookie.
You could store the last login date/time in the database and use that to
mark all messages before that time as 'read', clear out the cookie at the
beginning of a session and use that to deal with the latest messages as the
user views them.
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