Reporting

Couldn't agree more about dearth of solutions for reporting. A few months ago, Chris Anderson posted a nice series over on Silverlightshow.com (LOB app Parts 1-6). In Part 6, he showed how to hook up RDL files (without Reporting Services) to spit out a PDF (just requires the ubiquitous Adobe plugin) in the same window by hiding the Silverlight App and revealing the Report div. Pretty sharp if you can get the kinds of reports you need with the VS report designer. I'm sure it could be extended with some UI to control parameters (date ranges, etc.).

This is a tough issue for the third party vendors to offer reporting for SL. Here is my take.
Developing a full fledged reporting is a big job and depends heavily on text engine. Currently, SL doesn't have the best text engine, however that's something MS is working to make better. Secondly, for third party vendors to invest into this product, there must be some solid proof of "Return of Investment". If MS is already working on a reporting engine, then it's hard for smaller vendors to compete with that, and that's why no one is taking a shot at it.

Telerik has a reporting tool to create reports at server side as HTML and save it on the server and they just released 2009 Q1 for SL that also has an HTML placeholder where you can display HTML content. With this combination you can create your report and show it as HTML and have the user print the HTML page. It gets the job done, but requires lots of work keeping track of the reports per user and making sure they're deleted from server after the report has been printed ot viewed. But better than nothing.

Hope this helps!