pingMe is an easy to use remind me application, that uses natural language processing to create your reminders. Simply type in a reminder like "i need to go to the Dentist at 3 pm tomorrow" and pingMe will create the reminder for you. You can attach files and urls to each pingMe reminder task, and also sync your reminders to iCloud.
Drag and drop a url or any file into the pingMe task in the list view, a paperclip shows the pingMe has an attachment.
Integration with OSX notification centre.