Still worthless. Most keyword searches for tagged posts bring up nothing. Tagged posts.
I assume Tumblr is working on this.
in the meanwhile here is an obvy workaround, that might not be so obvy to those who do not have a search built into their external tumblr blog:
in the address bar of your browser add “/search/” and the keyword to the URL you are looking for.
example:
http:// yourtumblrname.tumblr.com/search/yourkeyword
