Sometime between Phantasmagoria and Phantasmagoria II were released, GOG's RSS channel stopped working for me (I know it was between those two games because I was informed about Phantasmagoria but not Phantasmagoria II). At the time, no changes were made to any of my systems, so I am nearly 100% certain something must have happened at GOG side. And looking into the RSS's XML file, it is obvious what: All items have the same GUID, which makes a compliant RSS-reader to:
1) only display one item.
2) think that all items were already read.
Please, fix this bug so that RSS works again. Thank you.

You should probably report this through the appropriate channels:
http://www.gog.com/en/support/contact/general_website_questions

GOG's twitter isn't updated regularly, too.

Now, I'm not completely sure, but I think this may be because of the entry "From Monochrome to Monarchy: King's Quest History - pt.1" (right before the Phantasmagoria 2 announcement), which contains an &amp, which in turn expands to &, which the RSS reader probably doesn't like when it's trying to parse the resulting HTML description. I think that one should be double-escaped to & to be completely kosher.
There was a similar case with the same character some time ago, nothing we can do but wait for three updates so that entry is no longer in the feed.

I noticed this a couple weeks ago, but figured it was some isolated funkiness with Thunderbird. Good to know I'm not the only one.

That's cause Tom was at GDC, I think. We got a few today so all should be back to normal.

Hmm didn't know that Tom takes care of the twitter feed. Anyway, I posted this before the today's tweets.

Not positive he does. Actually, he might not. So that'd be strange...

He doesn't do the Twitter page, it's Lukasz and some other dude.

Since this is the most recent thread, it seems, my reader, the default one in the Opera Internet Browser, hasn't updated the "GOG.com - News" feed since ever it seems, with the only entry being the "Syberia bundle 50% off" post, which may have been the one up at the time I subscribed, but I don't rightly remember.