So, as of August 12, 2010, here's my initial ratings for the gubernatorial races of 2010. I'll be updating this list periodically with more commentary when a race gets upgraded/downgraded.
Solid Democrat: HI, NH, NY
Strong Democrat: AR, CO, CT, MN
Lean Democrat: CA, MA, MD
Toss-up: FL, OR, NM
Lean Republican: ME, VT, MI, PA, OH, IL, WI, GA, TX
Strong Republican: IA, TN, NV
Solid Republican: AL, AK, AZ, KS, NE, OK, SC, SD, UT, WY, ID
Lean Independent: RI
Balance of Power
2010: 27D - 23R - 0I
2011: 20D - 29R - 1I
AR should be solid Democrat, CA and MD should both be tossups. CT and MN should be lean Democrat because I don't think the the races there have fully developed yet, the same for MA also.
In terms of the Republican groupings, OH, ME, GA, and VT should be tossups. While in the independent grouping RI should be considered a tossup also.