95% of tasks are courier pickup/dropoff within the metro Boston area. Traditional couriers require calling, getting quotes etc. Taskrabbit allows me to quickly find a courier (sometimes even within 60 minutes) that's vetted, reviewed, and professional. The app allows me to message/call them and has all my credit card information saved. Everything is done from my phone or browser (note: no paperwork). The experience is always better and cheaper than a 'professional' courier company.

EDIT: I usually pay $40-$90 for a metro Boston pickup/dropoff (about 1-2 hours of driving time). The app has an endless stream of sponsored promo codes (e.g. this week's 'The American Housewife' TV show $50 promo code) that almost always subsidize the service and ensures that I don't pay full price.

Lately, I've been thinking about the opportunity to create an Uber-like service that lowers prices by providing in-ride advertisements. Personally, I wouldn't mind a few ads if it means that I'll pay 50% less for my ride.