These sites are some handy places to visit for any webmaster:
Adobe Acrobat (PDF)
Adobe (home of Acrobat)
Internet Publishing with Acrobat
PurePDF
Desktop Publishing
Desktop Publishing
Desktop Publishing at the Mining Company
Graphic Design
Publish Magazine
Sullivan's Scanning Tips Online
Societies
International Webmasters Association (Free membership; lots of VERY useful links)
IWA Detroit Chapter
HTML Writers' Guild (Free membership; lots of VERY useful links)
Software

Other Resources
All Things Web
Bandwidth Conservation Society
Fusion Productions (Good strategic insights)
HTML at the Mining Company
HTML Goodies (Tutorials, scripts, set up a search for your site, etc.)
Information Warfare
Information Security
Matt's Script Archive, Inc.
Microsoft SiteBuilder Network (Free membership)
National CounterIntelligence Center
Noteworthy
Perl Scripts
Project Cool
Small Business Computing
Web Code Archive
Web Developer
WebReference
Web Review
WebSpice
Web Style Manual
Web Techniques
