And for those freepers who have been screaming for a "real filibuster" this is an important point as to why it hasn't happened since 1975.
The minority party only needs to keep one person in the Senate now, whereas the majority party needs to keep at least 50 present during a filibuster. That's definitely a greater hurdle for the majority party.
With the old rules, the minority party always had to keep at least 2/3 of members present, which at 50 means at least 26 to keep it from passing. That represents a greater hardship. In addition, it allowed the majority party to have fewer people there and still maintain a quorum.
You may misunderstand the cloture process, which is the general subject of the topic article. The cloture vote is scheduled at a time certain. It is impossible to "spring it" using surprise. Actually, all votes in the Senate are scheduled using either unanimous consent or cloture.
http://rules.senate.gov/senaterules/rule22.htm <-- The Cloture Rule