iTrackmine, as they mention is the only robust personal collection manager which helps you track and manage your collection of books, music, movies, electronic items and various other goods which you can access anywhere, once you sign up for a free account with them.
It is also a place where you can borrow and lent items. You can check out items your friends are willing to loan, track items you have lent to others, access friends’ wishlists and view their collections.
All this could be done from your cellphone which could help when you are out shopping and you need to check some details about a specific item in your collection.

There are many other features which iTrackmine claims to offer like ability to export your data, helping you remind about the books and dvds you have lent to friends and protecting your entire collection on secured servers.
Features:
- Manage and display collections online.
- See collections of others.
- Check out items your friends are willing to loan.
- Track items you have lent to others.
- Send auto reminders when the item is due to be returned.
- Mobile version available.
For similar site see Squirl as well as earlier article on open source collection manager apps.
Visit iTrackMine @ www.itrackmine.com (Contributed by Abhijeet from Jeet Blog)