Seen.to i'm in two minds about this design. Firstly, I love the idea! The speech bubbles and the text you've used are spot on, so thumbs up for that
I would probably join that community by looking at that advert...
The only issues I have with it, the colours (Not as attractive as I would like) I think it needs to use colours that really jump off the page! (see the banner I linked up) bright, vibrant colours to grab their attention. We need to push the "Win cash prizes" big style, that will get signups....we also need to push the "Free registration", make the domain stand out more as well, I find it hard to read "The friendly web site design forum". Nice slogan though
Seen.to you're along the right track (in terms of my perception of what I want the advert to say/do, it's just the design (colours, appeal) that needs tweaking. I can actually use a different advert in each issue....so this is definitly potential material! I'd love to see a revision though if possible.
Cheers!