Something handy I just ran across:
There are lots of people here who blog about Solaris, either as their main topic, or as the occasional tangent. If the blogger has tagged their post appropriately, here's a quick way to find them:
Note that this is a little different from using the "word cloud" you can find in the right-hand column on this page, since that only finds articles tagged in this blog. The above links will find all tagged blogs.oracle.com posts.
Some topics are a little trickier to nail down, because there may not be a standardized tag for the topic, so building a more conventional "blogroll" is on my to-do list.
UPDATE: Steph and Jeff beat me to it -- see the list on OTN.
In the meantime, you can also refer to the post Markus Weber made of interesting Solaris 11 launch-related posts.