iOS: Calendars can help you keep track of your day, but they don't always have all the relevant information about a specific event. Cue automatically grabs information from your cloud services and intelligently turns them into a timeline of your day, containing all the information you need about each event.
Cue is actually the next iteration of previously mentioned Greplin, the all-encompassing search engine for your cloud data. Cue takes all that info and puts it into a scheduled format. For example, if you're attending a Facebook event, it'll show it in your day, give you a link to map the location and give you the contact information of the person planning it. If you have an event on your calendar, it'll search your email for related emails on the subject and make them accessible right from there, along with the contact cards of the people you emailed with (seriously, it's genius the way it figures these things out). It'll scan your email and recognise package delivery dates, concert tickets, airline reservations and more. All you need to do is scroll through your day to see all the relevant information you could possibly need.
That said, it can be a little buggy at times. Sometimes it confuses a person here and there (like if two of your contacts have the same name), and sometimes and I've experienced one or two crashes. Also, when I first imported my information, it took a few hours for it to populate the timeline, even though it said it was ready to go -- so if you aren't seeing anything in your timeline, just give it a little while and come back later. Lastly (and this isn't a bug, but an annoyance), it only connects with cloud services -- meaning your iPhone's calendars or email accounts won't work, you actually need to connect it to a supported service like Google or Yahoo. It really is cool, and with a few bug fixes (not to mention a small tweak in the way you organise your contacts and calendars), it can be a pretty useful app.
Cue is a free download for iOS devices. A web version is on the way soon, and you can sign up to see when it's released on the website.
Cue [iTunes App Store]