What is the site about exactly? What's the URL of your site? I like the idea of the last two best, but it depends if it fits in with the site
I really like the first one best, I think it's the one that looks the most professional. However I do think it lacks a bit of contrast. Perhaps you could try to add some other colors to the 4 squares in the logo. And also try to play along with the contrast between the 2 pieces of text, like make one more bold or perhaps none caps.
I like the first and the last one, as the first one looks neat and the last one is gorgeous. But it depends on your websites.
I like the first two logos but would change the font of the second one. for some reason it looks blurred?!
Good work but i see this types of logo work before. The first one logo is just look like Microsoft open office.
About the first logo, you pick a good color and whatever design was that it's simple and neat, nice to look at however I notice it's not proportion. Can you make it perfect diamond shape? Curve corners are fine just make it same size all side. I like the second also, the idea of a glass like however can you make it more look like glass like add some glare on it or make it more transparent. The distance of the side and the bulb in the middle are not the same though you may want to make it the same so it will look you cut the bulb shape into the piece of glass. Third design is simple yet catchy just one little changes. can you make the gears proportion? The last one is great! Love it but will it fit to the company? I mean what is the company's product? If they go worldwide this is great but if local only then.... Hope these helps you
The logos are very nice.The last logo is different and looking great. Why should you not do the job of making logo and banner.
I don't think your choice of fonts is particularly good on any of the logos. They all have a bit of potential but you need to make sure that the typography, graphic and spacing all work as a whole.