iKeif is my pod-neighbour at Resource. We both started at Resource this year as Sr (Front-end) Developers, coming over from large corporations. We share many of the same interests and opinions on the UX/Web field (at least, he doesn’t disagree with me..!). If I hear of a new service, he’s probably already investigated it. Lately we’ve both been figuring out where we stood on the different lifestreaming services and how to manage the various “updates” each will cheerfully send off.
I’ll speak to this a little, but I hope he’ll chime in as well 
I have two major profiles online: this blog and my facebook profile. I will readily admit that I select other online services based on their integration with these platforms. I had the visual bookshelf application on facebook until I realized that shelfari had both a facebook app and a widget. Keith had asked me about this, so I assume he made the same decision. The fewer manual “syncs” a person has to do, the better! Sharing every detail of your life with the world shouldn’t be hard, should it?
Recently I turned to friendfeed as an aggregator. I used to have both my twitter updates and my del.icio.us bookmarks on my sidebar of my blog as well as as standalone apps on facebook, but I’ve consolidated. I try to be careful not to duplicate my content pushes too much.
Part of the challenge as well is determining “what update goes where”? I asked another coworker this a few weeks ago: he had both tumblr and del.icio.us and I wasn’t sure what he used when. His response was that tumblr was for sharing with others, del.icio.us was for reference. Well that sufficed for me, and I’ve recently started tumbling. For me, tumblr is the light version of this blog: things I want to share or comment on, but not to the extent of a post like this.
I also recently set up feedburner, and there is an option to include your daily del.icio.us links with your feed. I’ve started doing so, but it has impacted how I bookmark. I now try to add in some notes, keeping the new audience in mind. Keith mentioned he’s recently started doing this as well. He’s set up his automated services a bit more aggressively than I; his del.icio.us links feed into his live blog, which then sends out a tweet notifying people thereof! So whereas I am trying for a separation of the content from one service to the next, he’s tying them together as a single offering. It’s like two sides of the same “content/lifestream management” coin.
I mentioned struggling with deciding if I needed a tumblr account or not, and there have been a few other services we’ve chatted about. We both have pownce, but I haven’t really used it yet. We were actually brainstorming on some uses today, so we’ll see if it has a place in our online lifestream arsenal..
At this stage in the game, I’m still figuring out my general setup - and as I write for a few blogs, it also means I get the added bonus of trying to figure out managing posting to multiple sites (if applicable). Currently, my site is my playground, testing the settings - especially the del.icio.us/twitter feed duplication, friendfeed, and the multiplicity present in most “web 2.0″ applications.
I think tumblr is where I’m willing to draw the line - most often, I email stuff I want people to see (or IM). I blog about stuff I’m interested in discussing, or, essentially, thinking out loud.
Really, the internet is an evolving beast (yes, I love that word), and things will constantly change as long as our lives are entangled with it. I have a feeling I may keep the accounts open (and do my best to entangle them all to essentially promote my writing) but at the same time, that’s the danger of every web 2.0 app I’ve seen - they essentially do the same thing, of promoting blogs. Tweets then become blog updaters, as well as the “email update” you can have, as well as the half-dozen other applications that do the same thing!
Granted, the majority of applications are still in early stages, but if they don’t evolve from being the same thing (I see twitter staying ’simple’ - for now, as that IS it’s main appeal) they either will combine, die, or split. Inevitably, this is web 3.0 in the making. I see too many duplicate applications, too many “web apps” that could be reduced into one, and too many widgets competing for the same space.
This is getting much longer (and rambling) then I’d like, so I’ll try to write more about this later.