Best Alternatives To Stumble Upon

1. reddit.com: what's new online
Submit and read popular links to what's new and interesting online.
http://www.reddit.com/

2.Slashdot: News for nerds, stuff that matters
Threaded discussions related to news for nerds.
http://slashdot.org/

3.Techmeme
Blog that auto-generates a news summary every five minutes, focusing on technology, particularly tech business news and innovations in computing and the Internet.
http://www.techmeme.com/

4.Newsvine - Get Smarter Here
News service which, as well as reporting the latest news, allows users to comment and chat about every article, write their own columns, and point readers to other stories.
http://www.newsvine.com/

5.TechCrunch
Dedicated to obsessively profiling and reviewing new Web 2.0 products and companies.

http://www.techcrunch.com/

6. The Register: Sci/Tech News for the World
Biting the hand that feeds IT.
http://www.theregister.co.uk/

7. Techdirt.
http://techdirt.com/index.php

8. Ars Technica
The PC enthusiast's resource. Power users and the tools they love, without computing religion.
http://arstechnica.com/

9. Boing Boing: A Directory of Wonderful Things
Blogging about what's new in science, technology, industrial design, toys, and art.
http://boingboing.net/

10.kuro5hin.org || technology and culture, from the trenches
Threaded discussions on technology and culture.
http://www.kuro5hin.org/