, you say "I'm a little reluctant to start thinking about adding blog-like features to G+ when Google already offers a product that serves that need!" ... but it seems to me that more and more people are choosing to make G+ their blog platform of choice, or are using G+ in close-conjunction with their blog (i.e. "Hi G+ people! I've made a long carefully-formatted blogpost about $topic, check out my blog about it if you're interested. [blogpost link] #topic #subtopic #keyword").
Hashtags are great, don't get me wrong, they're been really useful on twitter. But seeing them here surrounded by certain other features which seem much more elegant, especially prepended to posts... I'm struck by this powerful feeling that G+ can and should do better.
It makes sense to me that an elegant tagging functionality absolutely has a place here on G+. I've been appending hashtags to my posts so that I can do an advanced websearch and find my own G+ posts on a particular topic, but I'd really like a tagcloud of all of my G+ posts, and for the tags on individual posts to be clickable-to-present-a-popup with the following choices: (1) posts by this individual using this tag which I have permission to view, (2) posts in my circles using this tag which I have permission to view, and (3) public posts by anyone using this tag.
Yes, Sparks should work together with whatever solution(s) come forth.
But I'm also thinking about Google's bookmarking functionality, and the notion of tagging bookmarks... I'm thinking of the sorts of functionalities and use cases of Delicious, and the (more limited, less portable) Memories functionality in Livejournal and its code forks, and Google Bookmarks. There's got to be some synergy to be found among those concepts. Perhaps somehow integrating a widget that adds posts easily to a collection of tagged, searchable bookmarks at the time of posting or reading... (side note: cutting and pasting long URLs while Multiple Login'd with multiple tabs open and the /u/1 oddity is a pain) ...
Oh, wait. Huh. Another idea: Currently, the G+ +1's Tab shows all the webpages we've +1'd, and I live in hope that it will also soon show the G+ posts we've +1'd, and maybe even the comments we've +1'd, as links. I'd find it immensely handy if there were built into that Tab the ability for me to tag those links any way I want.... select one or more link, add arbitrary tags that are searchable later... and also give me a tagcloud of how I've tagged all of those +1s.
I suppose at this point I should simply as G+ for a pony, too, but hey, it can't hurt to brainstorm, right?