If you're already writing in to the site (thank you!) I hope these 'how-to' notes will give you some new ideas of what is possible here.
And if you're currently a reader, but thinking about writing in, I hope you'll see it isn't difficult.
The first note talks about tags and how to get the most out of them.
Other topics I have in mind are maps, cleaning up old images, photo-stitching and panoramas, and places. Is there anything else that you've seen here, and you'd like to know more about?