I would like to request one more thing. Please remove the white shiny part at the top of the cloud image. I would like to compare another improved one to the current one.
Yes all versions you see background is transparent, complete logo is vector and fully editable, the cloud's gradient background is separated from every element in the logo, in any case you might think the logo looks better without the gradient you can remove it without any difficulty, you can place the logo with transparent background anywhere you like, i can send you a photoshop file version or transparent PNG file also.
This is the very first time I held contests. You are a very great and helpful designer! I just selected you as a winner. We are looking forward to your reply!