The list of those fighting Acacia at:
http://www.fightthepatent.com/v2/PornPartners.html
has been updated given the news of Top Bucks signing (Acacia put out a PR statement this morning as well).
Top Bucks was part of the Defense Group and did contribute financially to the Defense Group.
Also updated to the page, is Silvercash and Maxcash fighting the lawsuit, but not part of the defense group.
No confirmation/comment yet from Spike since west coast people are probably still sleeping... (except for you west coast early birds)
Fight the Time Zones!