TalkTop
You can talk about/comment on everything with google tools.
The bigs:
google
apple
Microsoft
IBM
HP
Amazon
Yahoo
Dell
SONY
Lenovo
Intel
AMD
Web2.0:
facebook
Twitter
Digg
flickr
myspace
linkedin
Youtube
Bing
ebay
HULU
Software:
Linux
Windows
Ubuntu
Mac
java
Wordpress
ChromeOS
firefox
Chrome
PHP
MySql
PhotoShop
Mobile:
Android
Nokia
Palm
Blackberry
WindowsMobile
iphone
Motorola
Dopod
SonyEricsson
Alcatel
anycall
HTC
LG
iMate
Nec
o2
Panasonic
VKmobile
Vertu
Toshiba
Sharp
Philips
China:
baidu
sina
sohu
163
youku
kaixin001
QQ
tudou
douban