Web: Part of building a good network is regularly touching base with certain people. And well, it can't hurt to extend that to your personal life and drop a line to old friends. TinyBlu is a simple webapp to remind you when it's been too long since you last spoke with someone.
Here's how it works. You add a person as a "lifeline" and classify them into a group. You are also prompted to set how many days should pass without contact before TinyBlu reminds you to get in touch.
Click the Update button for any lifeline to add details about when you last met, what you did, add any notes, and even add other participants from your lifelines. The data is represented in a bar with green and red colors, and matching emoticons, to tell you at a glance who you should contact. You'll also get a reminder email from TinyBlu if you enable that option.
TinyBlu's simplicity sets it apart from other such apps, and it doesn't require access to any of your private data on email or social networks.