6 hours until the cap reset and I've already run out of votes to grant for the day. This is unfortunate for people providing good questions or answers, but wholly understandable.
As I understand it, the stackoverflow 'day' resets for everyone at the same time, correct? (8pm Eastern Time?)
If this is the case, and if a majority of active users are hitting the daily vote cap, then people asking good questions and providing good answers near the end of the day are less likely to get votes than those just after the day resets. If the 'day' reset for different people at different times, distributed around the clock, then this problem could be avoided.
It would be very interesting if someone with deep access to the data ran a query to validate or refute the existence of this problem.
Edit: I've just discovered data.stackexchange.com; I'll see if I am able to create a query to find out this information or not and report back either way.
OK, apparently there is not much of a problem here (or, as the downvote indicated: "this idea sux!!1!"). I've created two queries to track average question score by hour and average answer score by hour. I've graphed the results of both:
Although perceived quality of questions and answers dips around +0900 UTC, there is not (as I had feared) a strong downward slope towards the end of the day resetting at +0000 UTC.
It was fun to play with data.stackexchange.com, though. :)