Some good points:
1) It's simple. Incredibly simple. It is for lack of a better word streamlined.
2) It can post to multiple blogs from the same interface as well as Twitter among other things. About nine blog types just glancing at the drop-down list. That's pretty impressive. It also includes Dreamwidth and Insanejournal among those.
3) It doesn't use a ton of memory or resources. I'm currently typing on an Asus EEE 701SD(?) netbook using Ubuntu NBR 10.x with only 256M of ram. xPostulate seems to run quite well under those conditions and the developer seems to understand that just because you have large resources is no reason to produce bloated code.
4) The developer is currently approachable. That makes a big difference when trying to solve a problem. That obviously changes over time as things get more popular but it's an excellent way to support what you create.
Some bad points:
1) No spellcheck. I'm a horrible speller and slightly dyslexic. Manually correcting all my words a lot fo the time is very very troublesome for me. That little red line you see with most inline spellcheckers makes all the difference.
2) No "post to all" button. This is no longer a big issue for me since Dreamwidth cross-posts properly but if you can't automatically cross-post a big "One-Damn-Button" would make a world of difference.
3) The server name list is not friendly. It's not intuitive that Ljxml means Livejournal. Most people can figure it out easily enough but using friendly names goes a long way towards reducing support questions and making an intuitive interface.
4) (Technical) Passwords and usernames in the config file are not hashed. I know this would add bloat but in light of the recent Gawker database thing security is on my mind.
5) Saved entries do not include the subject, tags, category, etc. so if you save your work and open it later you have to remember what title, etc. you want to use. Not too bad just a little annoying.
6) None of the more commong blog posting choices on the server list like Blogger, Wordpress, Drupal, etc. Mediawiki would be nice as well. (Mediawiki or Drupal would be interesting choices. When I ran Mediawiki as a blogging platform on my home server there was almost NOTHING that was a remote posting tool.)
I'm sure I'll find other things for now but those are the biggies. What it comes down to is I love the software and thank the developer profusely for creating it and hope he can implement the rest of the things over time. :-)
Cross-posted from Dreamwidth ( http://nimitzbrood.dreamwidth.org/208633.html ) but feel free to comment here as well.