Google lets you create Google Now reminders on the Web
Google has added another functionality to its search engine to make it easier for you to get your reminders. The search box can now be used to set reminders for Google Now. All you need to do is type in “Add reminder” or “Create reminder” and text boxes will appear. It will also allow you to set specific times, dates, and location, among other things. Quite a nifty addition to your Web browser, we have to say.
Source: Google Operating System