Many times it is useful to see summaries as a word cloud to see from many possibilities what the general theme is a of particular prop / eVar.
Consider something like your internal search term (although there might be many other such uses, such as errors, user feedback etc.). If you can create a weighted word cloud based off any metric (instances as a default), then you can very quickly see common themes and then drill into those to investigate them further, e.g.. http://www.wordle.net/advanced .
This gives you a powerful way to not only graph the numbers, but also the textual content.
