I think, between Tumblr Crosspostr, SM2WP, Social, MailChimp, and a well-timed animal sacrifice, I might have gotten all my social network/blog sites tied together, and successfully set up my tumblr as an aggregate blog, pulling together posts from all my sites into one semi-coherent whole.
I give it three months until someone changes something in their API or widgets or zip code, and the whole house of cards comes down.
Maybe three weeks.
Sun spots!
Consider drawing a diagram. It will be amusing to look at in a year.
Huh.
I tend to use WordPress as the aggregate blog for exactly this reason. :) Plus, of course, if I can get it into WordPress, then I can keep it in a portable data format forever. Open source may be finicky at times but at least it tends to be super portable and free!
On that note: http://maymay.net/blog/2014/01/30/if-you-miss-tumblrize-tumblr-crosspostr-is-for-you/
FWIW, Tumblr's been pretty steady and I haven't needed to issue an update to Tumblr Crosspostr in quite some time. Regardless, I'm glad you're finding the plugin useful. :)
I love it. My wife and I are both using it.