If you're looking for online stuff particularly have a look on
Conceptart.org, there are lots of great sculptors posting there. YouTube now has a great deal of videos showing sculpting, a few good ones are linked to in
this thread from pF recently, which has a few other links of interest too (don't miss the second page).
Busts are mostly about the face and head so looking for tuts on those two can be helpful, instead of just doing searches for guides to sculpting busts.
What material do you intend to sculpt in? This has quite a bearing on armature/underlay design and to some extent basic methodology - polymer clay, epoxy putty, real clay and sculptors' wax all need to be worked with slightly differently. There are a few good books on sculpting in clay that are worth the investment, although the techniques aren't all directly applicable to common modelling materials two good ones that focus on the head are
The Portrait In Clay by Peter Rubino and
Modelling The Head In Clay by Bruno Lucchesi. And
here is a great little SBS from Conceptart from 2005 (using Super Sculpey) that's been linked to a couple of times.
Einion
