Our friends at MailChimp have made their eBook on User eXperience available for free:
At MailChimp, we love to show our work—partly because it makes us better at what we do. This ebook is a collection of the most popular articles from our UX Newsletter, along with some exclusive content. It embodies our quest to reflect, refine, and grow. We hope it’ll help you do the same. ~ MailChimp
Excellent website by a team of web designers, developers and strategists: Hanno. Their playbook is worth a look.
Mockingbird is an online tool that makes it easy for you to create, link together, preview, and share mockups of your website or application. ~ Mockingbird.
I’ve used Mockingbird, and I can recommend it. Their web app’s minimal approach to design lets you focus on functionality, layout, and user experience without having to nail down what everything is going to look like. This is a great approach to use with clients who have a hard time separating user experience versus design details.