The Annual AACSB salary survey is the definitive source for business school faculty salaries. Here's the most important table from the report - it shows the mean salaries for new doctorates for the major business disciplines
The figures above are for 9-month salaries. At research schools, summer research support can add another 10-20% to that, and there are also opportunities to pick up additional $$ teaching over the summer. However, at teaching oriented schools, there typically isn't summer support, and summer teaching money is also much lower.
For years, Finance professors got the highest salaries across all business disciplines. That's changed in the last few years, with accounting salaries pulling ahead. The increase in accounting new-hire salaries is likely due to smaller numbers of accounting PhD's being graduated and a lot of retirements in their field. But still, $120K isn't bad.
Click here for the free executive summary (you can also get the full report, but it'll cost you).