Signing up for a website is a big commitment for most people. Users that sign up for your website are giving their personal information and trust to you. If you misuse their personal information or violate their trust, you can upset your users. Most users today are more wary than ever about who handles their personal information. In a cyber world full of hackers and spammers, who can blame them? If you aren’t seeing many sign ups, your form is raising a red flag for users. Here are eight reasons users don’t fill out sign up forms.

From the Baymard Institute: "During our recent checkout study we found several usability issues when using a drop-down for your country selector: a lack of overview, unclear sorting, scrolling issues, inconsistent UIs, a lack of context on mobile devices, and finally, they break the user's tab-flow.

So we took it upon ourselves to redesign the country selector."

Chosen is a javsacript plug-in that makes long, unwieldy select boxes much more user-friendly. It is currently available in both jQuery and Prototype flavors.

A source of regularly used Inputs-Patterns. Which is basically built-in masking/regex. A good idea, good start of useful patterns.

wicked cool.

I don't use YUI, I'm more of a jQuery type of guy. But this is very nice. Very very nice indeed.

When creating a web form, one of the many choices you must make is how you are going to align your labels with your inputs. This is not a trivial decision, as this placement affects the readability/usability of your form, completion rates, speed of completion, and ultimately the satisfaction level of the users trying to get through your form.

A very good demo of CSS and XHTML forms.

Usability, accessibility, semantics, CSS, HTML and forms. All in one article.

PPK's explanation on how to label and classify your form elements.