Since our introductory blogpost about the extension gallery, we've been thrilled by all of the useful and interesting Google Wave extensions coming out of the developer community. With every enhancement we announce, developers find inventive ways to create handy extensions. Accordingly, the number of extensions is growing, and we would like to introduce a few improvements we've made to make it easier to discover, browse, and sample extensions for yourself. Starting at the top, you will notice we replaced the previous Extensions link with a dedicated Extensions section. This section lets you check out "Featured" extensions that our team would like to highlight -- the Wave team occasionally selects these extensions because we think they're particularly useful, user-friendly and "Wave-y." You can also browse many other extensions in our gallery via the "All" link.…