anallawalla - 1:44 am on Aug 7, 2010 (gmt 0)
theoretically, if I submit to Google's local search and am accepted, this may positively affect my rankings for those keywords in the general SERPs.
I used to work at a large directory that is a data provider to Google Maps, so I had the luxury to browse through the 7-packs and glance below to see any correlation in the rankings of the same business in the organic results.
My assessment is that there is none.
Then, OTOH, some of my own sites are not in the above directory but were hand-submitted. Some phrases rank in the onebox and some rank in the organic top results, but none of them are in both sets.
Therefore, your efforts to optimise for both locations are on the right track.