also, check out the Sun documentation:
http://docs.sun.com/app/docs/prod/solaris.10
it's pretty comprehensive though it makes for dry reading. you can use it as a reference.
misc links:
http://www.sun.drydog.com/
http://www.sun.com/bigadmin/home/
http://www.princeton.edu/~unix/Solar...oot/index.html
http://cuddletech.com/blog/
http://wikis.sun.com/display/BluePrints/
i can't recommend any Solaris book on sys-administration because i haven't read any. but i did read a lot of articles from various links. that along with sun docs and installing and playing around with solaris on my home computer is good enough to get me a Sun certification - not showing off, only want to say that if you find it interesting then you can learn quite a bit just by hacking, and that way its fun too.