Links which may be useful to Horde developers.
+++ Security
[http://www.owasp.org/ Top Vulnerabilities in Web Applications]. It may be most efficient to pick one potential vulnerability and audit the entire code base for it before moving on to the next vulnerability.
[http://www.theregister.co.uk/content/55/29511.html Top 10 e-commerce software flaws]
+++ Performance
[http://www.advogato.org/article/646.html Advogato article on large-scale web applications]
[http://www.zend.com/zend/art/ref-count.php A very good read on how references and reference counting work]
[http://phplens.com/lens/php-book/optimizing-debugging-php.php Some more optimization pointers]
[http://marc.theaimsgroup.com/?t=108277781300005&r=1&w=2 Discussion on internals@lists.php.net about "Performance Consideration of 1 class per file"]
+++ Horde based projects
+++ CSS quirks
+++ PNG Compression
+++ Database Conversion
+++ Forms
++++ General
[http://www.usability.com.au/resources/forms.cfm Accessible Forms von Roger Hudson]
[http://www.webstandards.org/learn/tutorials/accessible-forms/01-accessible-forms.html Accessible HTML/XHTML Forms von Ian Lloyd]
[http://www.themaninblue.com/writing/perspective/2004/03/24/ Accessible, stylish form layout von Cameron Adams]
[http://www.webaim.org/techniques/forms/ Creating Accessible Forms von !WebAIM - Web Accessibility in Mind]
[http://simon.incutio.com/archive/2003/06/17/theHolyGrail Easier form validation with PHP von Simon Willison]
[http://www.useit.com/alertbox/forms.html Jakob Nielsen's Alertbox - Forms vs. Applications]
[http://www.alistapart.com/articles/sensibleforms Sensible Forms: A Form Usability Checklist von Brian Crescimanno]
[http://www.sitepoint.com/print/1273 Simple Tricks for More Usable Forms von Simon Willison]
[http://www.stuffandnonsense.co.uk/archives/trimming_form_fields.html Trimming form fields von Andy Clarke]
[http://www.lukew.com/resources/articles/web_forms.html Web Application Form Design von Luke Wroblewski]
[http://www.lukew.com/ff/entry.asp?155 Web Application Form Design Expanded von Luke Wroblewski]
[http://particletree.com/features/10-tips-to-a-better-form/ 10 Tips To A Better Form von Chris Campbell]
++++ Design
[http://www.cssplay.co.uk/menu/form.html A FORM WITH STYLE von Stu Nicholls]
[http://ajform.sourceforge.net/ AJFORM - World's Easiest !JavaScript AJAX !ToolKit]
[http://www.dustindiaz.com/ajax-contact-form/ An AJAX Contact Form von Dustin Diaz]
[http://www.webcredible.co.uk/user-friendly-resources/css/css-forms.shtml Applying CSS to forms von Trenton Moss]
[http://jeffhowden.com/code/css/forms/ CSS-Only, Table-less Forms von Jeff Howden]
[http://www.stichpunkt.de/css/formulare.html Formulare gestalten ohne Tabellen von Thomas Stich]
[http://www.style-sheets.de/guide/formulare/formulare_per_css_layouten Formulare per CSS Layouten von Gerrit Kaiser]
[http://www.badboy.ro/articles/2005-07-23/index.php Niceforms von Lucian Slatineanu]
[http://www.456bereastreet.com/archive/200410/styling_even_more_form_controls/ Styling even more form controls von Roger Johansson]
[http://www.stuffandnonsense.co.uk/archives/stylish_accessible_forms.html Stylish, accessible forms von by Andy Clarke]
[http://www.formassembly.com/index.php The Form Assembly - Makes Web Forms Simple. Create web forms, host them online, receive responses via email or RSS]
[http://www.einfach-fuer-alle.de/artikel/formulare/ Tutorial: Bessere Formulare - Ein Tutorial in vier Teilen]
[http://www.hisoftware.com/access/valueadd9.html Accessible Form Creator - allows you to create forms for web sites containing all the additional markup required to make the forms accessible under Section 508 standards and the !W3C WCAG 1.0 Priority 1-3 Guidelines.]
[http://www.tele-pro.co.uk/scripts/contact_form/ Contact Form Generator - The free Website Contact Form Generator utility enables you to create form-to-email scripts for your ASP, PHP or Perl web site with no programming skills needed.]
[http://phpfmg.sourceforge.net/home.php PHP !FormMail Generator - A tool to create ready-to-use web forms in a flash. Once the form has been generated, you have a full functional web form. Including error checking of required fields, email address validation, credit card number & expiry date checking, multiple attachments sending, and email auto responding.]
[http://www.1street.de/osc/catalog/product_info.php?cPath=29&products_id=29 - Visual Form Maker - Webformulare (PHP/HTML) Webformulare, PHP Formulare (mySQL, E-Mail) visuell gestalten! - Freeware]