Some menu icons look vertically off-center

[Danielle Foré]

What steps will reproduce the problem?
1. In standard gnome menu, hover mouse over System -> Preferences
2. In standard gnome menu, hover mouse over Places -> Desktop
3. In standard gnome menu, hover mouse over Application -> Accessories ->
Terminal

What is the expected output? What do you see instead?
These menu icons appear to sit vertically "lower" than others in the menu.
I would expect them to appear vertically middle aligned.

What version of the product are you using? On what operating system?
elementary-icons_2.0, Ubuntu 9.04 (alpha) AMD64

Please provide any additional information below.
e.g.
24x24/categories/preferences-desktop.svg
24x24/apps/utilities-terminal.svg
24x24/places/user-desktop.svg
The off-centering is equally visible when these icons are added to the
panel itself, e.g. as application launchers

[Danielle Foré (danrabbit)]

I've fixed all the icons noted here and more.