Seeking an experienced writer of technical articles

Hello, I am looking for English-speaking, experienced technical articles writer for long-term partnership. You should have knowledge in the following areas and ability to express thoughts clear: 1) XML related technologies 2) HTML/CSS tips and tricks for webmasters 3) Search engine optimisation 4) Making money online 5) E-commerce, email marketing Articles should have keyword density of at most 3% and be of 500 words length. Flexible rates and deadlines are strongly encouraged. Only unique content will be accepted and paid for. Thanks