Hi all,
I'm upgrading to D7 from D6, and finding it incredibly difficult. My site makes heavy use of three modules, which have disappeared:
* audio: has moved into core, but doesn't seem to have all the functionality there. I also have to run a rather sketchy experimental module from someone's git repo to migrate content (http://drupal.org/sandbox/jenlampton/1761334 - I'm saying sketchy as I had to twiddle version numbers to get it to run, and it's not entirely clear whether it worked or not yet).
* img_assist: hasn't been ported, looks like it won't be, and there doesn't exist a sensible replacement (works concisely in non-WYSIWYG, has useful options to pop up images, lightbox etc.). There is a port, but it's unmaintained, only linked on a semi-dead forum post (http://drupal.org/node/841568) and I don't know if it works. There are also scripts to turn everything into HTML so that might be the way to go. But it's certainly not as nice to work with.
* mediawiki_filter: unported, although a possibly-good version of it is kicking around.
I understand that mediawiki was never official. But, at the time, all three seemed to be the best practise for their respective tasks. Now, it seems to be impossible to upgrade my site - I've spent many, many hours reading posts, trying updates etc. And I haven't even looked at more advanced bits of the site.