Rochester TV station WHEC has a story about how the Massa campaign uses "cyberspace", with Massa's MySpace page as the example. While it's true that Massa has a MySpace page, that just scratches the surface of the differences in the two campaigns' approaches to using the Internet. The Massa website is full of detailed information about the candidate's positions, solicits online fundraising, and is constantly updated.
Massa also posts a diary regularly on DailyKos, and that diary is replicated across a number of "netroots" sites like MyDD and the TPMCafe. I don't think those efforts will gain Massa many votes in the 29th, but they have helped him in other ways. One of the reasons that Massa has raised $800K from individuals is online contributions (often small, like $20) from readers of these sites. In addition, Massa's participation in the discussion threads on those sites has probably helped him sharpen his positions on some issues.
The Kuhl campaign's site does not solicit donations and is infrequently updated. Kuhl says:
What were doing is taking the old fashioned way [...] Taking the shoe leather on the street, right out to the people and saying hello.
It's not an either/or. For example, Reader Rich points to Massa's election-day schedule, which begins at 4:15 a.m. in Pittsford and ends in Corning at 9 p.m. That kind of schedule is typical for Massa, who's run a hard campaign on the ground as well as in "cyberspace".
What's Randy Kuhl doing tomorrow? I have no idea -- it isn't posted on his website.