About a month after Opera 9 final was released comes Opera 9.01 with the following changelog:

-Empty spam puts messages in trash again
-Fixes to contenteditable
-Several stability fixes
-Several IMAP fixes
-Open image in mail does now opens in new tab
-Fixed bug where inline error messages opened blank
-Fixed bug where Java Applet did not load when width and height set to 0
-Chat colors (re)fixed
-Search field now shows dropdown when using the down arrow key.

Fixed bug where Error console constantly appeared by renaming preference from “Console Filter” to “Error Console Filter”

Filters with huge numbers of mail will now act significantly faster.

Via Opera Blog