Just got started with Houdini and interested in doing some snow falling to import into Nuke. I am aware that there is a snow solver in the HDK but not sure I should try to work off that. I see lots of smoke, fire, particle, fluid tutorials… but where are the snow ones? There are a few for Maya, but none for Houdini.

$10 for anyone who can point me to a decent snow tutorial!

In terms of accumulating snow, you might want to search for posts on sand instead.
Also check these videos for more violent snow:
end of video 1 & beginning of video 2:
http://www.cgchannel.com/2010/03/the-making-of-the-mummy-3/ [cgchannel.com]

I don't know if this helps or not. But SideFX just released a snow digital asset on the Orbolt site. 8)

http://www.orbolt.com/asset/SideFX::snoweffect [orbolt.com]

The great Peter Quint has just posted some snow tutorials:

http://vimeo.com/83233835 [vimeo.com]
http://vimeo.com/83235663 [vimeo.com]

Hope it helps.