One big problem i thought recently relates on the user experience and user usability. User interface is very important in online business. Your client is kept out of your door just because of you did not pay more effects on the usability. Poor usability leads poor ROI. That is the key element why your business grows slow. But it always not too late to improve the usability of your web site.
So i added a category on my blog. Keep an eye on user interface design.

Key points to improve the usability:

* Keep clean and simple

* Less colors, but more contrast

* Bigger font

* Split different area by edge or space

Good usability examples: