The Gang of 14 signed an agreement, pertaining to the 109th Congress only, whereby the seven Senate Democrats would no longer vote along with their party on filibustering judicial nominees (except in “extraordinary circumstances,” as defined by each individual senator), and in turn the seven Senate Republicans would break with Bill Frist and the Republican leadership on voting for the “nuclear option.” As the Republicans held a five-vote Senate majority (55-45) in the 109th Congress, the agreement of these Senators in practical terms prevented the Republicans from winning a simple majority to uphold a change in the interpretation of Senate rules, and prevented the Democrats from mustering the 41 votes necessary to sustain a filibuster. While thwarting the goals of their respective party leaderships,[2] the group members were hailed as moderates who put aside severe partisanship to do what was best for the Senate. At the same time, some of the Republican members of the Gang of 14 faced political firestorms from the conservative base due to their participation in this agreement.
(unreliable wikipedia)
If I am not mistaken, some "extraordinary circumstances" occurred in fairly short order and the Democrat Senators mounted several filibusters during the remainder of the 109th Congress. None impacted judicial appointments, however.