Companies

Web SiteLinkComments
PanaVisehttp://www.panavise.com/
Rigol Technologies Inchttp://www.rigolna.com/Digital oscilloscopes and other measurement devices at a very attractive price point (relatively speaking). This brand offers a lot of bang for the buck.
Vertex Machineryhttp://www.vertex-tw.com.tw/One of the better Chinese brands of machine tooling. Their 4" Kurt-clone machine vice is the best knock-off I've been able to find.
Vogel Germanyhttp://www.vogel-germany.de/This is one step up in quality compared to the typical Chinese tooling being sold, but still less expensive than e.g. Mitutoyo. I would expect that most of their products are still Chinese-manufactured, but with better quality control, and slightly better finishing. All measurement tools have tolerances specified according to DIN standards, which is very nice.

Forums

Web SiteLinkComments
CNC Zonehttp://www.cnczone.com/All things related to CNC. A forum with amazing breadth and activity.
Frylunds Fagteorihttp://forumfagteori.ef.dk/forum/About the only dedicated Danish forum I know of
The Hobby-Machinisthttp://www.hobby-machinist.com/Also a very extensive forum site. As of 2013 it's only three years old, but it still has an impressive number of users, and most forums seem very active.
The Home Machinist!http://www.chaski.org/homemachinist/A site dedicated to enthusiasts of all skill levels and disciplines of the metalworking hobby.
The Home Shop Machinist & Machinist's Workshop BBShttp://bbs.homeshopmachinist.net/The companion forum the "Home Shop Machinist" magazine.
Practical Machinisthttp://www.practicalmachinist.com/

Blogs & Homepages

Web SiteLinkComments
CNC Cookbookhttp://www.cnccookbook.com/
Fretshttp://www.frets.com/HomeShopTech/hstpages.htmlAmazing collection of shop tips
Frylunds Fagteori - Teori i industriteknikhttp://www.fagteori.dk/Lots of good information - in Danish!
GadgetBuilderhttp://www.gadgetbuilder.com/
Home Shop Machining Projectshttp://www.deansphotographica.com/machining/projects/projects.htmlOne person, very impressive projects
HOME SHOP TECH Articles by Frank Fordhttp://www.frets.com/HomeShopTech/hstpages.htmlWebsite of Frank Ford. One of the most impressive personal home pages I know of. Dedicated to machining and related disciplines..
Mini-Lathe.comhttp://www.mini-lathe.comLots of information on the mini lathe and mini mill.
Mini-Lathe Workshop - Amateur's workshop toolshttp://homepage3.nifty.com/amigos/index-e.htmlA very talented Japanese who maintains an English version of his Japanese site. Imagine having to keep two sites in sync! Nice work.
Rick's Web Sitehttp://rick.sparber.org/ma.htmRick Sparber has written some great articles on the precision of Chinese scales, and the jitter problem in the Shumatech DRO 350 consoles.
The Steampunk Workshophttp://www.steampunkworkshop.com/Fantastic projects in brass

Shopping

Web SiteLinkComments
Arc Euro Tradehttp://www.arceurotrade.co.uk/Carries MT3 tooling with M12 drawbar threading (instead of 3/8" and 1/2" BSW). Fantastic guide on X3 preparation.
Chronos Engineering Supplieshttp://www.chronos.ltd.uk/
DamenCNChttp://www.damencnc.com/Dutch-based company specializing in parts for building CNC machines.
Kalibrierservice24.dehttp://www.kalibrierservice24.de/Offers a good selection of measurement products from Vogel Germany.
Long Island Indicator Servicehttp://longislandindicator.com/On of the best websites I've found on dial indicators. This really should not go under "shopping", but it is a store, and so it does.
Machine-DROhttp://www.machine-dro.co.uk/UK based webshop that specializes in DRO equipment, and a limited selection of other measuring equipment. They have nice digital height gauges at a good price point.
RC Machineshttp://www.rc-machines.euThe most extensive selection of any shop I've found. Prices and quality are similar to the UK based webshops.
RDG Toolshttp://rdgtools.co.uk/
Sorotechttp://www.sorotec.de/German supplier of machine tools and CNC components