Over the years I've come across a lot of useful resources. I've collected them in one handy place for you here.

Best Site for New Ideas

Must Read Blogs About Publishing Industry
Robin Sullivan's Write to Publish
Joe Konrath's Newbie Guide to Publishing
The Passive Voice
Kristine Kathryn Rusch's Blog
Dean Wesley Smith's Blog
David Gaughran's Blog
Writer's Beware Blog
Writer's Beware Website
Publisher's Lunch
Publisher's Marketplace

Kindle Only Review Sites:Alchemy of Scrawl | Ebook Addict | Kindle Nation Daily | Kindle Obsessed | Mrs. Giggles.Com | Red Adept Reviews
Amazon Tagging: Tag My Book

Washington DC Writing Groups
Robin Sullivan's Write 2 Publish
Virginia: Arlington Writer's Group

Maryland: Silver Springs Writer's Group

Vendor Sites
Bookmark and Postcard Printing
Free Business Cards
Poster Printing
Packing Materials
Merchandise: T-shirts | Coffee Mugs
Print on Demand: CreateSpace | Lightning Source
Short Run Book Book Printing: Apex

Recommended Books & Websites
2011 Writer's Market  Deluxe Edition
2011 Guide to Literary Agents
2011 Novel And Short Story Writer's Market 
2011 Poet's Market
2011 Christian Writers' Market Guide
2011 Children's Writer's And Illustrator's Market

Digital Shorts by Robin Sullivan
The Changing Face of Publishing

Getting Agents and Writing Queries
Noah Lukeman's How to Write a Winning Query Letter (Free PDF)
Query Shark (Example Critiqued Queries)
Michael Larsen's How to Get a Literary Agent 
Preditors and Editors
Agent Search: Publisher's Marketplace 
1000 Literary Agents
Agent Query
Query Tracker

Writing for a Living
Donald Mass's Writing the Breakout Novel
Donald Mass's The Career Novelist

About Writing Well and Editing
The Elemements of Style
Self Editing for Fiction Writers
The First Five Pages
The Plot Thickens
Stephen King's On Writing
Eats, Shoots an d Leaves
A Dash of Style Grammar Girl's Quick and Dirty Tricks
Common Errors in English Usage The Blue Book of Grammar and Punctuation
The Only Grammar Book You'll Ever Need
Online: Chicago Manual of Style

How To Guides
John Locke's How I Sold 1 Million Books in 5 Months
We Are Not Alone: A Writer's Guide to Social Media
The Essential Guide to Getting Your Book Published
Dan Poynter's Self-Publishing Manual 
Zoe Winters' Smart Self Publishing: Becoming an Indie Author

Titlez (Hourly tracking of Amazon Ranking - with Graphs)
Booklert (Emailed hourly tracking of Amazon Ranking)
Novel Rank (Graphs of Amazon Ranking)
Bitly (Shrink and track URL's)
Query Tracker (Track what agents you've submitted to)
Barcode Generator