Gmail could suprpass Hotmail’s numbers in 2009. Between September 2007 and September 2008, Gmail’s visitor total grew 39%, from 18.8 million to 26 million, ComScore figures indicate. Windows Live Hotmail during this period saw its visitor share decline 4%, from 46.2 million to 44.6 million.

Between December 2007 and December 2008, Gmail’s number of unique monthly visitors in the United States grew 43%, from 20.8 million to 29.6 million, according to ComScore. Windows Live Hotmail lost 5% of its unique monthly visitors during this period, falling from 45.7 million to 43.5 million.

If Google’s Gmail growth rate rises to, say, 46% over 2009, it could reach approximately 43 million unique U.S. visitors by the end of the year. And if Windows Live Hotmail continues to bleed visitors at a rate of, say, 3%, it will finish the year with around 42 million unique visitors per month.

Given all the recent announcements that Google has been making, all the new Google Labs features being pushed into Gmail, etc… Google seems poised to overtake Hotmail.