If using an abstract mark, it must not be larger than the logo text. If this is not possible, please aim for a more web2.0 logo than an abstract mark logo.
Please do not use gray for any of the letters.
Please keep in mind that the logo will be sitting on a blue background, and you have placed a white background.
I believe the color blue should be a bit brighter. More like a sky-blue.
The new ones are better. We screwed up by asking for a blue background.... kill that please.
Not fond of font in 4 and 5.
In # 6, it would be good to have symmetry with the abstract marks, like dots on both sides. My biz partner is very fond of the dots for some reason, whereas I like the arrows but would prefer for them to be thicker.
You can use white for the logo, not gray though. I really like something similar to skype's logo because of the color choice and one color behind the other.