A nice and quite unique perspective form taken from Breezi’s splash page, an ongoing web application developed by Freshout: it’s funny that, when you click on the sign up button, you almost smash it to the picture plane.

A nice picture, fresh and carefully selected can do wonders for your website: for example, sign up form are sometimes a little bit too bare, but you can warm up things with a colourful pic. Actually in this case the photo it’s the same from the home page but nevertheless it’s a good inspirational snip.
If [...]

Tumblr is one of my favorite example of effective user interaction model. The sign up form is a masterpiece of simplicity and functionality: no confirmation fields to fill in, no threatening messagges or red alerts for mandatory informations or complicated password policy, just a minimal sets of data, a nice copy on the top, a [...]

Here you are a  super clean sign up form from Gowalla which is basically a location-based game that
rewards you for visiting both everyday and extraordinary places
Ok that’s fun: but we’d want you to focus also on the smooth rounded fields and the green alert feedbacks that show up when you shift the focus from a [...]

Coolspotters is
a online service that makes it easy to discover and buy the products, brands, and fashions being used by your favorite celebrities – in their real lives, and in movies and television.
Coolspotters’ website features an interesting and quite articulate system of displaying error messages, while you’re still filling the sign up (or sign in) [...]

Connect-A-Sketch is a design tool that lets you create clickable prototypes from your wireframes and sketches. Its website displays a compact, streamlined, inspirational sign-in form: all the fields are incorporated in a gray arrow element laying on a textile pattern background. The log-in button, arrow-shaped too, stands out in the whole composition and enhances the feel of dynamism inherent [...]

Kontain is a service for sharing multimedia content online and an endless source of good ideas and inspiration.
The sing-up page for example contradicts with its bright colors and unusual distribution of  fields to be filled, all the standards that usually guide the design of such pages, producing an effect that is not of confusion but [...]

Impulse Studios footer conjugates both the functions of customers login and map site navigation.

Good header it’s a band with a set of links: by clicking on one of theme, you’ll make appear a new element that instead of exploding down, opens up pulling down the page.
The login mask, well structured, compact and discreet, follows the same behaviour.

Clear and simple, the registration form of Design Snack is one of my favorite: instructions for the compilation are enclosed and highlighted by  braces.

Interesting: another example of a sign in window, structured as a flowchart.
In this case it’s in Moblin web site, a project based on Linux open source platform.

Carbonmade is a valuable service for creatives and designers, that allows you to quickly create presentations and portfolios of your work. 
The login mask is placed at the end of an interesting “waterfall path”, made of colorful forms that attract the attention of the visitor and lead the eye to the sign in form.

A full Apple style for Mobile login mask: it’s clearly inspired by a minimalism so fashionable today, while on the other hand provides a wide range of visual signs.