The following websites are excellent resources to inspire creative sermon writing:
Preaching and Worship
PreachingandWorship.org aims to provide easy access to excellent on-line resources for preparing sermons and worship services for a wide range of denominations and traditions—a bit like a Google, Bing, or Yahoo search, specifically designed for preachers.
Patheos – Preachers
Patheos.com is the premier online destination to engage in the global dialogue about religion and spirituality and to explore and experience the world's beliefs.
Working Preacher has been a trusted source of inspiration, interpretation and imagination for preachers across the globe -- all for free.
The Text This Week
This site features a wide variety of resources for study and liturgy based on the 3-year Revised Common Lectionary* cycle.