David Nachbar, who briefly ran for the Democratic nomination in the 29th, has announced his candidacy for State Senate in District 55. That office is currently occupied by six-term Republican Jim Alesi. As you can see in Rochesterturning's post on the announcement, a large part of SD-55 is in the 29th District.
Having a well-financed challenger who will run an serious campaign is probably a benefit to Eric Massa, and the Massa campaign has already announced Massa's endorsement of Nachbar.
Update: Rochesterturning has a lengthy interview with Nachbar.