There are great articles about Web 2.0 Design Changes.  They are must read for any graphic designer or anyone who creates websites.

Here are a few of them:

WebDesign from Scratch
1stWebdesigner
TwoPointOh.me

But do Web 2.0 Design Guides Increase my Revenue?

How does web design 2.0 drive the ROI  (return on investment) on your website?  There are some basic guidelines what really and truly reformed the web 1.0 to 2.0 and you can add these to your new and current website(s) design.

• Integration with social media buttons:  I am sure you have read a great article on a website and you want to share this site with your colleague or even friends. It is really bothersome, if you have to copy the url (www.websiteaddress.com), paste it into your email and send it off to your boss or friends.  You can make it easy on your site visitors with some small tools such as addthis.  It creates a small icon that allows sharing of the site without having to go through the hassle of copy/paste, open email.  It is a JavaScript and any web designer can add this to your HTML pages.
• Most website do not have a click to call, chat or contact us button.  It is simple to implement but very necessary to encourage potential clients to start a conversation with you.  The button should  be at a prominent location and not hidden between all the design elements.  (That is were the simplicity of web 2.0 becomes important).  Graham Charlton wrote a great article on button design:  Can different button shapes improve conversions? In his review he outlines that an odd shaped button encourages a user to take actions as demonstrated with Amazon.com.
• Widgets:  there are really bits of code that can be installed on your web site.  There are many different types of widgets (applets) that can pull data into your site.  For example: there are widgets that allow you to display industry news.  Or you can display current events of your organization on the home page.  The key is to get other people content onto your site to stay current.  If your site is static, visitors are not encouraged to come back.  Think of CNN: you come back to read today’s news and not what happened 3 weeks ago.

The difference is that websites are not any longer just business cards, but visitors would like to be able to give input and/or read news.  Here is also a great graphic demonstrating the difference between web 1.0 and web 2.0. Its is created by blog.aysoon.com

Let me know what improves your user experience on websites.