Those lists are always updated, nor are they very active.. monitoring the errata page is the recommended method, but some people have created unofficial RSS feeds that you could utilize.
The most reliable one would likely be the
undeadly.org feed, I cannot however recommend any additional software that can alert you of new erratas.. you're on your own.
It is currently targeting the 4.5 release now, not 4.4.. perhaps someone else knows of a 4.4 feed.