I have a friend who would like to keep herself up-to-date but she doesn't know anything that could look like HN for graphic designers (mostly print). In fact, anything could go : a blog, a forum or whatever.
No personal experience there, but I've heard a lot of good things about Forrst (<a href="http://forrst.com" rel="nofollow">http://forrst.com</a>). As far as blogs go, Smashing Magazine (<a href="http://smashingmagazine.com" rel="nofollow">http://smashingmagazine.com</a>), A List Apart (<a href="http://alistapart.com" rel="nofollow">http://alistapart.com</a>), and Think Vitamin (<a href="http://thinkvitamin.com" rel="nofollow">http://thinkvitamin.com</a>) come to mind.
Check out <a href="http://www.qbn.com/" rel="nofollow">http://www.qbn.com/</a> and <a href="http://www.behance.net/" rel="nofollow">http://www.behance.net/</a>.
Reddit - several of the subreddits are quite good. Try:<p><a href="http://www.reddit.com/r/design/" rel="nofollow">http://www.reddit.com/r/design/</a> - general design<p><a href="http://www.reddit.com/r/web_design/" rel="nofollow">http://www.reddit.com/r/web_design/</a> - web design<p>Both of these pages have more specialized subreddits linked in the sidebar (e.g., <a href="http://www.reddit.com/r/designthought" rel="nofollow">http://www.reddit.com/r/designthought</a>).
I left the print design world many moons ago, but here are a few that may or may not be what you're looking for:<p><a href="http://designobserver.com/" rel="nofollow">http://designobserver.com/</a>
<a href="http://www.drawar.com/" rel="nofollow">http://www.drawar.com/</a>
<a href="http://www.undrln.com/" rel="nofollow">http://www.undrln.com/</a>
UnderConsideration's Quipsologies and For Print Only (FPO) are design metablogs that regularly feature great print work:<p><a href="http://www.underconsideraton.com/quipsologies" rel="nofollow">http://www.underconsideraton.com/quipsologies</a>
<a href="http://www.underconsideration.com/fpo/" rel="nofollow">http://www.underconsideration.com/fpo/</a><p>There's also idsgn: <a href="http://idsgn.org/" rel="nofollow">http://idsgn.org/</a>
The designers in my office are all <a href="http://dribbble.com/" rel="nofollow">http://dribbble.com/</a> fans but they're all web designers and not print.<p>I personally like <a href="http://notcot.org/" rel="nofollow">http://notcot.org/</a> for designy stuff as well, which hasn't been mentioned in the comments so far.
It is more like the graphic designers are hooked on inspirational social networks like
<a href="http://ffffound.com" rel="nofollow">http://ffffound.com</a>
<a href="http://dribbble.com/" rel="nofollow">http://dribbble.com/</a>
<a href="http://emberapp.com/" rel="nofollow">http://emberapp.com/</a>