I'd like to see more customizabliity for the dashboards. Right now you can either do 50% width or 100% width, which looks odd when you have just a single number there.
I'd like to see this more like Salesforce, which allows you to make your dashboard into 12 seperate columns. This would help me show more data without having excessive whit space and excessive scrolling. With this i'd also like to see the ability to make the reports on a dashboard shorter since they tend to have alot of white space, as seen in my screenshot above.
Here is a screenshot of the way Salesforce does their columns / rows:
