If you are looking for some inspiration for creating a new logo then you should check out www.logopond.com. Below you will find some great designs I discovered.
This website is great way to get lots of exposure to your design portfolio. Many people view, rate and comment on the logos which gives you feedback on your designs and drives traffic to your site.
Below are a few sample logos from their website.
This logo was created for a graphic design studio in Newcastle, UK. I love the 2 in the D of duo.
Logo for a game publisher urban empires. Note the nice touch of the city skyscrapers forming the teeth of the skull.
By Kult House
Logo design for talkonomics.com website. I like the color scheme and overall design of this one.