This is a collection of random links (mainly for my reference), but most are just cool in some way or another. This is a page for great things in MY opinion, spammy emails sent to me asking for a link here will be deleted and ignored!
CSS
Nice Styled Tables – http://veerle-v2.duoh.com/blog/comments/a_css_styled_table/
Even Nicer Tables - http://coding.smashingmagazine.com/2008/08/13/top-10-css-table-designs/
Beautiful CSS Buttons – http://woork.blogspot.com/2008/06/beautiful-css-buttons-with-icon-set.html
Nice CSS Buttons – http://particletree.com/features/rediscovering-the-button-element/
More Nice Buttons – http://www.monc.se/kitchen/59/scalable-css-buttons-using-png-and-background-colors
CSS3 Rounded Corners (CSS3,Moz&Webkit) – http://www.the-art-of-web.com/css/border-radius/
Nice Style Sheet - http://medialoot.com/preview/css-ui-kit/demo.html
Images
Some nice free icons – http://sublink.ca/icons/
API’s
Yahoo! Developer network – http://developer.yahoo.com/everything.html
PHP
Some insight into secure php forms – http://corpocrat.com/2007/11/28/implementing-secure-file-upload-in-php/
Twitter OAuth stuff – http://www.jaisenmathai.com/blog/2009/04/30/letting-your-users-sign-in-with-twitter-with-oauth/
URL Shortener – http://yourls.org/
QRCode Zend Framework Module - http://code.google.com/p/zend-framework-matrixcode-module/ (hosted version here http://qr.inthepocket.mobi/)
Google Checkout PHP Class - http://www.phpclasses.org/browse/file/29458.html
iPhone Dev
Information and loading display stuff – https://github.com/jdg/MBProgressHUD
A good summary on iPhone Actions and Alerts – http://www.peachpit.com/articles/article.aspx?p=1400864&seqNum=6
XML Parsing with GDataXML – http://www.raywenderlich.com/725/how-to-read-and-write-xml-documents-with-gdataxml
Singleton Class – http://iphone.galloway.me.uk/iphone-sdktutorials/singleton-classes/
iPhone Connectivity Framework – http://allseeing-i.com/ASIHTTPRequest/
iPhone App Analytics – http://www.flurry.com/about-us/merger/welcome.html
NSError Stuff – http://www.cimgf.com/2008/04/04/cocoa-tutorial-using-nserror-to-great-effect/
Image Sizes & naming conventions – http://aralbalkan.com/3314
Build a simple RSS reader – http://gigaom.com/apple/tutorial-build-a-simple-rss-reader-for-iphone/
Map Stuff (not really iPhone, but I will be using the techniques in an iPhone project 
) – http://gebweb.net/optimap/
WordPress
How to Create A Custom WordPress Meta Box Instead of Using WordPress Custom Fields - http://www.farinspace.com/how-to-create-custom-wordpress-meta-box/
13 Useful WordPress SQL Queries You Wish You Knew Earlier - http://www.onextrapixel.com/2010/01/30/13-useful-wordpress-sql-queries-you-wish-you-knew-earlier/
Some Linux Stuff
securing /tmp - http://www.debian-administration.org/articles/57
Maintenance page with .htaccess – http://www.webreference.com/programming/Apache-Site-Down-Notice/
Misc
RegEx Tester - http://www.regextester.com/ (This deserves a bookmark, I used it when developing a large number of complicated custom RegExes!!!)
Some electronic logic stuff – http://www.vias.org/feee/karnaugh_09.html
PDF to Word Converter - http://www.zamzar.com/
Test data generator - http://www.fakenamegenerator.com/
Random Template Site – themeforest.net / www.freecsstemplates.org
Random SEO Stuff – http://www.semrush.com/
Chromium OS Install - http://www.extremetech.com/computing/84134-how-to-make-your-own-chrome-os-chromebook/1
PHP CLI Colour – http://www.if-not-true-then-false.com/2010/php-class-for-coloring-php-command-line-cli-scripts-output-php-output-colorizing-using-bash-shell-colors/#comment-18169
Term Colours - http://linuxtoolkit.blogspot.com/2009/06/painting-ls-on-bash.html - dircolors -p > ~/.dircolors
Wine Portfolio - http://www.frw.co.uk/portfolio-add.aspx?show=1
Random Funny - http://likeaphobia.us/picture/3236/oh,-i-see
Generate Docx with PHP - https://github.com/djpate/phpdocx
Open Source Invoicing System – http://www.simpleinvoices.org/go
Linux Clear Swap – http://www.linuxnetadmin.com/2008/11/clear-swap-space-in-linux.html
BCS Application – http://www.bcs.org/content/ConWebDoc/26399
Simple Email Encryption – http://www.knechtology.com/stop-spam/email_encoder.html
Slicehost article repo – http://articles.slicehost.com/
802.11 Frequency Channel Map
Facebook Like - https://www.facebook.com/application.development.design?sk=app_14167664298
A really good sticker printing company – http://stickerprinting.org.uk/