I've signed up and created a couple of groups. Here's my thoughts and feedback after exploring what I could find:<p>1. Need a favicon. In the expectation that I'll use the service, I added it to my bookmarks bar - where it shows up as the default icon. d'oh!<p>2. Notification on new posts is great! I'd also like the option to subscribe to new comments as well. Two levels: 1) an option to automatically subscribe to comments for each new post, and 2) an option on each post to subscribe to that post. I would use the former; but most would probably like the latter to subscribe to the occasional interesting post. Also, 3) if both above options were implemented, an option to unsubscribe from new commenta made to a post (that would over-ride the global subscription comments - so I could opt-out of a post I had no interest in)<p>3. UI when uploading a pic could use some work. I'm not sure what you can detect, but I assume you can know how many files you're getting - at a bare minimum, "Uploading $num of $total..." would be a help.<p>4. Youtube videos are only embedded when the URL is the entirety of the post. Took me a few tries to figure that out... Perhaps a button like "Add a Youtube video" that, when clicked, becomes a text box to paste the URL into with a "Post" button on that...<p>5. Similarly - it looks to me like pictures upload as a separate post - so instead of clicking in the post field, then clicking 'add pictures' - maybe that should be separated out like the Youtube button idea above - an "add pictures" button (or separate function somewhere easy to find, but separate from a text post). Well, could even have tabbed submission - chosing text or pics or youtube...<p>6. Profile pics need a little work: looks like it makes the largest square it can from the picture, starting at top-left, and cuts off the rest of the picture. All thumbnails seem to do this, which is a little odd. Might be better to at least center the square in the cropped dimension... On the profile pic: Being able to drag the image to set what part of the image was displayed for the profile pic would be awesome, and UI-light, I'd think.<p>7. Per a suggestion below, I set up an "HN" group - for anyone interested: <a href="http://www.frid.ge/?ginvitation=3kharhhlv8owo4wgk0wwo4kcc" rel="nofollow">http://www.frid.ge/?ginvitation=3kharhhlv8owo4wgk0wwo4kcc</a> - I note that the email address to send is at "hn@" - which is great. To test, I set up another group also called "HN", and its email is "hn1@" - which means this is extraordinarily easy for spammers to guess... certainly to send to a@, b@, c@ etc... Also, when I changed the name of the group and created another "HN" - it got the "hn1@" email - meaning if the name is changed and someone has the old addy in their address book and someone else uses the name.......... I don't see how this can end well, even if I like the email feature itself.<p>I like the cleanliness of the interface. I like the ease of switching between the groups I created.<p>I hope this takes off - it seems useful and good.