Well I've been creating seamless textures for some time now. I've created over 250 and have many posted up to this blog.
I've decided to make life easier for everyone to find and download my textures and have created a Flikr Set of 50 seamless textures all located in one spot. I'll be uploading more Texture Packs in the future, however you can still find all the textures just by scrolling through my blog. Please let me know if you've used the textures and which ones you liked the best.