Script Summary: For new version of Gmail: when viewing a message/conversation, the advertisement box on the right is removed and messages and reply box occupy the full width available. Long titles are optionally truncated.
If you're still using the old version of Gmail, Gmail Full Width does the job.
This script won't work with the old version of Gmail.
With a long title, not truncated:
At the top of the script the
truncate variable specifies whether the subject line gets truncated or not if it is too long, so that it and the blue links are all on the same line:
truncate is a boolean (true or false), false by default. If you mouse over the title, the full length of it will be exposed.
The "map this" feature will stay in the right-hand column (so it will not be hidden). Please leave a comment if you think this sucks.
Also please leave a message if you find any bugs.
Updated 26 September 2009
Finally. :) It just reflects Gmail's new code (which is nicer and less bloated). The only major change is what happens to the "map this" and "track that" features. They now will stay in the right column (everything else removed). Unfortunately I can't test this as it seems to not work in the UK.