Some of the things I've found useful --
Write notes about a webinar, following instructions on key things to notice and questions to ask. http://www.taskrabbit.com/virtual/t/take-notes-from-a-1-hour...
Attend a lecture, write a trip report, take pictures. http://www.taskrabbit.com/seattle-wa/t/attend-a-talk-at-uw-a...
Count number of businesses on FB matching certain criteria. http://www.taskrabbit.com/virtual/t/estimate-number-of-faceb...
Handle the legwork for contacting ~30 vendors on aliexprss.com to open initial discussions about custom clothing. http://www.taskrabbit.com/virtual/t/virtual-assistance-resea...
Helping me attend a meeting via Skype in a different city. http://www.taskrabbit.com/san-francisco-ca/t/help-me-attend-...