PNG ICO ICNS MORE
UI
Pixel
Fugue Icons
question, shield
RoyalBlue
16x16
question
MediumBlue
Sweetie Web Communication
question, Comment
Silver
Comment, square, question
PNG MORE
Comment, question
24x24
Comment, square, help
BWPX
18x18
Blue, question
DarkSlateGray
32x32
Desktop apps
Splashyfish
Information, Comment, question
DarkGray
Tango
infomation, worning, Dialog
Tomato
Mixed
Twotiny
DarkGreen
10x16
Computer & hardware
ASP.NET icons
question, help
DodgerBlue
Mini
question, Info, help
CornflowerBlue