Some plugins:

http://www.sparrowhawke3d.com/
http://www.inagoni.com/news.php
http://www.digitalcarversguild.com/
http://www.des-web.net/shoestring_graphics.html

Some tutorials:

http://www.markbremmer.com/pages/TutMain.html
http://www.aceanim.com/Carrara/Carrra6NLA.htm
http://digitalpainters.net/index.php?topic=310.msg1410;topicseen#new
http://backroom.renderosity.com/~carrara/tutorials/gear/index.html
http://www.sentrygirl.com/anims/flametut/flametut.htm
http://www.awbenson.com/tutorials.htm

Here at Renderosity you can find good shaders and some more things in Daz like my two packs:
http://www.daz3d.com/i.x/shop/itemdetails/-/?item=5891&cat=421
http://www.daz3d.com/i.x/shop/itemdetails/-/?item=5550&cat=450

And the first commerial dynamic hair for Vic4 (can be adjusted to workin Aiko and others)
http://www.daz3d.com/i.x/shop/itemdetails/-/?item=5870&cat=450

have fun

Follow me at euQfiz Digital