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It would seem a one vote per entry per user system was launched yesterday here on Newgrounds. Vote on an entry and the next time you visit that entry, you will see a message similar to the one below where the Voting Bar was:
Granted, this was talked about in considerable detail months ago with a very extensive article from Tom Fulp himself. No news about this suggests numerous possibilities, such as:
1. This may be a beta or test period and this latest feature may be temporary
2. Newgrounds staff is anticipating massive backlash
While YouTube has been doing a one-vote system since the beginning, this definitely changes the dynamics of Newgrounds in a huge manner, especially since, for better or worse, it's been business as usual for over a decade.
No need to worry about your vote being permanent, as Tom Fulp has stated that you will be able to edit your vote at some point in the future.
Should be interesting to see how this is going to affect Newgrounds short and longterm. In the short term, I imagine this transition is not going to go over very smoothly with users. ^_^;