Here is a pretty complete list with sizes:
Those with VBSEO can just copy and paste this list into "Other Enhancements" - "Image Size Attributes", which will save you from hunting down template edits.
Code:
'buttons/collapse_40b.png' => '13x13'
'buttons/firstnew-comment.png' => '16x16'
'buttons/lastpost-right.png' => '12x10'
'cms/categories.png' => '16x16'
'cms/read_more-right.png' => '16x16'
'cms/sections.png' => '16x16'
'cms/widget-comment.png' => '16x16'
'cms/widget-forum.png' => '16x16'
'icons/icon11.png' => '16x16'
'icons/icon5.png' => '16x16'
'misc/facebook_login.png' => '89x21'
'misc/forum_stats.png' => '16x16'
'misc/legend.png' => '16x16'
'misc/lightbox_progress.gif' => '300x200'
'misc/navbit-home.png' => '12x12'
'misc/progress2.gif' => '16x16'
'misc/rss_40b.png' => '12x12'
'misc/tab-collapsed.png' => '28x36'
'misc/unknown_sm.png' => '30x30'
'misc/users_online.png' => '16x16'
'site_icons/password.png' => '16x16'
'site_icons/username.png' => '16x16'
'statusicon/category-16.png' => '16x16'
'statusicon/forum_link-16.png' => '16x16'
'statusicon/forum_new-16.png' => '16x16'
'statusicon/forum_new-48.png' => '48x48'
'statusicon/forum_old-16.png' => '16x16'
'statusicon/forum_old-48.png' => '48x48'
'statusicon/subforum_old.png' => '12x11'
'statusicon/subforum_old-48.png' => '12x11'