Technical Books

[knoba]

I'll second http://www.archive.org, they are an amazing resource. Check out "machinery" (old, but excellent reading).

Good info from online material Associations, like;
British Stainless Steel Association (stainless steel)
Copper.org: Copper Development Association - Information on copper and its alloys.
etc.

Manufacturers products...
Deep groove ball bearings, ICOS oil sealed bearing units

Specialist tooling companies like;
Cibo | cibo
Sjöbergs, Stockaryd, Sweden | Original Sjöbergs Workbenchench, woodwork, textile, workshop, handicraft, Stockarydsbänken

Forums, like this one...

I'd still recommend a small personal library of printed books too (handy to refer to in the workshop), in the UK the "workshop practice series" are very good and reasonably priced (...ebay). Must be some equivalent in the States...

A copy of "Mechanical engineers pocket book" by Roger Timings & "Zeus Precision Data Charts and Reference Tables for Drawing Office, Toolroom & Workshop" are both a must.