alta88 has recently done a bunch of work to integrate Snowl with Places. His initial efforts have focused on getting sources and people into Places, as he describes in this post to the discussion forum.
This will make the list of collections in the next version of Snowl work like Firefox's list of bookmarks in the Bookmarks Sidebar, and sources/people will also show up in the AwesomeBar:
Snowl doesn't yet register the snowl: protocol, however, so selecting those items doesn't do anything (yet). What do you think it should do?
And what additional Places-backed features would be useful?
(Picking up on something dietrich said on Twitter last week, I'd love to see Places get populated with tweets that reference a URL, setting the title of the Places entry to the content of the tweet, so you can use the AwesomeBar to find that site you saw last week in a tweet, as other folks have done with Delicious.)