I finally got around to writing something to solve this on my system, if you want to read about it I wrote it up, the code is available for download at the bottom of the post.
Code from the creek...: Use Rows & Columns reports in Dashlets
Your link no longer works, but I'm left wondering again why not bring back the old dashlet (Sugar v6.x) that allowed you to display results from any report, rather than the current that only allows display of just the charts?
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CRM Business Consultant
Ken, this is very impressive. We bought a custom dashlet from W-Systems two years ago that does exactly that. With your code, there would've been no need for it.
I hope to have a better version of this with version 9 of SugarCRM. I am not sure why this isn’t baked into the system, everyone I talk to wants it.