MetaLab is an Interface Design Agency, so it shouldn't come as a surprise that Flow is slick and easy-to-use whether it be on the web, iPhone or iPad. Founder and CEO Andrew Wilkinson started the company in 2006 and has worked with some impressive clients to date - you've likely seen their ubiquitous Tumblr theme Fluid or maybe Wilkinson's advice for Zappos' Tony Hsieh.
Signing up for Flow takes about 30 seconds and once your account is live the single dashboard app walks you through all the features in a matter of minutes. To create a task, you enter a name, a due date, any contacts you’d like to delegate the task to, and relevant tags. Tasks can be grouped into projects, and team members can append attachments and comments to each task.
For those in the habit of emailing themselves reminders, the service also supports email allowing you to send notes to email@example.com.
After a 14-day free trial, Flow costs $10 a month or $99 a year. Definitely worth checking out.