For the most part, the SiteCatalyst interface works well across the major browsers. We also have the iPhone and Blackberry dashboard viewer for mobile use. However, one relatively small change would go a long way for all touch screen devices. Rework the metric selector!
Right now the only way to change metrics in a report is with a "double-click" or a "drag and drop". This is IMPOSSIBLE on touch devices. It's also very frustrating, because everything else seems to work great!
The selector for trended reports already works!
In addition to supporting touch devices, this could be a step forward towards a fully WCAG accessible SiteCatalyst. But I have to say you have a lot of work on that front (just try to "tab" past the report suite selector). Web accessibility is something that all web applications should strive for in my opinion.