Ranked:

#6 in Thunderbird Add-Ons, #22 in Thunderbird, #29 in Mozilla Thunderbird, #49 in Thunderbird Extensions, #225 in Instant Messaging, #1,456 in Add-Ons, #2,036 in Portable Apps, #3,682 in GTD, #4,106 in Delicious, #27,147 in Computer