Here are some comments and tips, I hope you find them helpful.
Simple is sometimes better.
A complex logo can be difficult to reproduce and more importantly, difficult to remember. Not sure what the purpose of the lines are, other then to create a complex illusion, possibly motion?
A logo doesn't have to convey what your company does. Think the McDonald's Golden Arches. No hamburgers. While sometimes having a logo that portrays an element of the company is appropriate, it's often better to have a logo that's graphically void of detail - a logo that can be adapted to whatever direction the company takes. Think the Apple logo. True, it is an apple. But there's no indication that it belongs to a computer company. That's a pretty cool thing - the Apple logo looks just as cool on an iPod as it does on the top of a Powerbook.
Size matters.
As the other poster eluded to, your new logo needs to reproduce at a variety of different sizes - particularly on the smallish side. Overly complex logos like the ones you have done here can 'gum up' when reproduced as a very small image. Think business card, fax header. How about a key chain? Or a ballpoint pen? Take a look at the Nike 'swoosh'. Not a very dynamic logo but it is recognizable on a shirt sleeve on the television where a complex logo wouldn't be. Think of your logo as a mega-sized image as well. Like on a facade or store front. Knowing how your logo is going to be used, both in size and media, can help with designing a logo that's appropriate in terms of complexity.
Aspect Ratios.
The aspect ratio (the relationship between the height and width of a logo) is critical. A logo that is oblong or misshaped (as seen in two of your concepts) is not visually pleasing, and you'll end up with all sorts of layout issues when it comes to setting up your logo in artwork, especially when combined with other graphic elements (ie: business card, websites, etc). A logo that is closer to a 'golden mean' (almost the aspect relationship of a business card) is much more pleasing and more adaptable to working in other artwork. Square is pretty cool too - circle logos are very strong visually due to their 'square aspect ratio'. For further reading, search "Golden Mean" OR "Golden Ratio" and "Design" in a search engine.
Colour is a secondary factor in your logo.
The most important part of your logo project is the design itself. Oh sure, it's nice to see your logo in the colours that you will eventually use, but in the initial stages of any design process the colours are of secondary importance. They can always be changed,or edited later. I would definitely stay away from gradients. Once you have the fundamental design and template in place, you can discuss colours and their purposes - whether you utilize a two spot colour, or four colour process design, this should come secondary to the intial layout and artwork.