14 DAY TRIAL // I don't know for how long you've been an internet user, but if your experience goes way back to the '90's, you're in for a flashback, the sepia nuanced type. Google has brought back the feature that allows you to copy the address on top of your page as a sort of a permalink to it, whether it is a certain conversation, a label or a search results page.
The changing of the URL (that's what the address is called, for those who didn't know) with every different action you attempt might mean the world to those who use various Google Apps and might need to link Google Calendar to a conversation about a birthday, for example. It's as easy as pie, the patented copy/paste method will always do the trick. However, such posting of URLs in public places is not recommended, as one can never know how the permalink ID could be abused with some hack.
Because of the deal between Google and Firefox regarding the default homepage of the browser being set to the Mountain View based company's search engine, Firefox received a pretty useful package addition with the update: the possibility to create a shortcut for a label bookmark (these bookmark indexations were also included now). If one URL was labeled by you with, say, friends, all you need to do is write in the Firefox address bar "friends" and it'll take you straight to the GMail label/folder and the conversations in it.
Or you could let someone that hasn't yet read the email you sent him the direct link to the conversation via IM and speed up the whole process. I'm not sure how important would have to be in order for someone to be doing this instead of letting the other know via IM what it was all about, but the bottom line is that you can do it. Happy linking!