Not quite, because you don't search for projects, only issues. But, run a filter for "all issues I want to report on" to start with (you may want to exclude closed issues for example). Save it, and then use it in dashboard gadgets.
If you're running this for "all the stuff assigned to me", a simple filter statistics gadget will do it - use your filter and select the "project" field. You'll get a bar chart showing how many issues you have assigned in each project. For everyone, try the 2d filter gadget instead, selecting assignee and project as the axes. It'll be big and clunky, but it'll answer the question.
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