An update on the Tumblr for HWN experiment:
Tumblr's email gateway is supposed to support markdown, although the latter already requires additional work on my part. However, their parsing doesn't understand links mangled by mail agents that enforce the 70-character wraparound rule.
I've even tried using a *nix command-line mail that allows arbitrarily long lines. I now discover that Tumblr chokes on anchor tags like this:
http://some.where/link#anchor and parses #anchor as a Tumblr-specific entry-classification tag.
Why oh why can't Tumblr take in HTML-ized email and Do The Right Thing.
The short of it is that I've blown my HWN time budget trying to make rss work via Tumblr.
I ask that you and anyone else inconvenienced by the absence of syndication to use workarounds for now.
If I find more spare time next month, I'll experiment further.
p.s. Any assistance on HWN is always welcome.