In Opera 11, the blog post doesn't show tags, but the main site does show tags. This may be the problem @tsanzer was experiencing.
When zooming (ctrl-scrollwheel, e.g.), the tags are not in their correct positions (at least in Chrome).
If I "unhover" sometimes, the application still thinks I'm hovering over the tag. I can reproduce this bug in several ways. For example, hover over a tag, and move the cursor up slowly.
Other comments:
I like that I can hilight a tag's text and even click links!
Flickr (and Facebook) integration would be fantastic!
Service looks really simple and fits a specific need. Don't bloat it too much or it'll lose its elegance.
> How would you promote it?
(Optional?) watermark on images (on hover). Flickr/Facebook integration.