Until now… Enter the Wordpress application from the app store. errrrm… ok… But it didn’t work for me. It would consistently crash and restarting the app would just crash immediately. I determined this was because I am running a Wordpress multi-site. Whether it is or not, I found the fix:
Please open “your/wordpress/directory/xmlrpc.php” in any text editor, and rewrite the line 477,
'blogid' => $blog_id,
'blogid' => (string) $blog_id,.
Yeah! Now, you can use WordPress for iOS!
Now I’m a happy camper…
BTW, I found this solution here, look for the first comment dated 05/07/2010.
edit: today I upgraded wordpress to the latest version 3.01 and I checked the above file, it has not been fixed. If you install the 3.01 update, you will also need to re-edit and include the string cast for the blogid.
on a side note: I also use tumblr, and the tumblr app for the iPhone is equally FANTASTIC! Highly suggested and recommended if you use tumblr.