FollowUp! is a great little app that allows you to set reminders for yourself to read or reply to important emails when you’re too busy to read them immediately. If you’ve been looking for something to help you save more time while you’re cruising through your bloated inbox, PeeKaWho – a fine piece of app that gives you caller-ID like functionality for emails and SMSs on your device – AND FollowUp! integrate so that you don’t even have to anymore! Well, at least not initially. You can follow up directly from the popup, and that’s pretty sweet when you’re on the move and you don’t want to forget to reply to that important email from your spouse, or lose out on a time-sensitive coupon.