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 a free service that allows you to create and share the digital equivalent of online mix tapes.To make a mix you simply pick any 8 songs (about 30 minutes of music) using the site's drag and drop functionality.  8tracks allows you to search their network of previously uploaded tracks by song, artist or genre. You can also upload music from your own library.  When you're done you can add artwork and short descriptor to your masterpiece. Publishing a mix tape allows you to share it with the 8 Tracks community and with your friends (or, if you want, just one special friend), via Twitter and Facebook You can also listen to any of the 65,000 mixes already on the site (we found some great ones and discovered a ton of new music along the way).

Geni, a free genealogy service that works by tapping the collected wisdom of your relatives.To begin, simply add information about yourself and at least one of your parents. (You can enter photos, birthdays and a myriad of custom facts for every person you add).   To increase the size of your tree, include as many people as you can. (Since the entire application is Flash-based, reorganizing your branches is as simple as dragging and dropping). Whenever a family member is added that person is invited to view the tree and--this is the key part--supply details about themselves and other relatives.   This collaborative aspect is one of the site's main strengths. (You can also merge trees when you find a common ancestor). When you've built your genealogical base you can share it via the site's social networking tools. One feature we like is their Statistics app, which turns family data (oldest and youngest members, age distribution, life expectancy, most frequent birth months, political views, etc.) into colorful nerdy pie charts.

a service that organizes your flights, car rentals and hotel bookings, storing them all in one easy-to-access place (i.e. your phone).Just sign up for a free account and begin adding your upcoming trips. You can either input information manually or simply forward travel confirmation emails to the site and they'll do it for you. (We like the latter route since we're a tad lazy).   While the site is useful, what really makes this service sing is the iPhone app, which features a host of additional features, including maps to get you to the airport and seat plans of the plane you'll be flying. In other good news, TripIt recently teamed up with Yapta (as covered in Netted, Yapta helps assure you get low-priced airfares). Now when you forward flight confirmation emails to TripIt,Yapta can track your for lower ticket prices or refunds with a single click. If your airfare dips they'll help you get a refund for the difference. You can also share travel plans with friends (when you register it searches your address book and Facebook account for other TripIt users). That way, if somebody you know is also going to be in, say, Maui, you'll be able to connect with them, and you'll know their itinerary (and vice versa).