PerfX Image X is very nice but if you want to try with Acrobat 9, it seems to be possible. I made a preflight profile using what is called a "vérification personnalisée" in my french version of Acrobat (maybe "custom checks" in english). I choosed to add three times the same action but with different settings (245, 300 and 340% of TAC, for instance). The first one will trigger an information, the second a warning and the third an error. Then, I made a droplet with this profile. You only have to drop your file on the droplet and you receive a report with all the information you need. It's not fast but it works…
Sorry for the screen capture in french, but I don't have an english version.
APFill is an inexpenive software that can calculate ink coverage. I have used it to build pricing structures for toner based machines.
Depending on your workflow if you have digital equipment that uses a Fiery rip and can get the grahics arts package premium edition they have tools in it as well. Which is nice to see how your color management sytems (profiles etc) change the coverage and percentages.