How to get an autostart application to start minimized upon login?

"These window behaviors are managed by Metacity I believe, you can use Devil's Pie to do what you want though.

A window-matching utility, inspired by
Sawfish's ""Matched Windows"" option and
the lack of the functionality in
Metacity. Metacity lacking window
matching is not a bad thing — Metacity
is a lean window manager, and window
matching does not have to be a window
manager task.

Devil's Pie can be configured to
detect windows as they are created,
and match the window to a set of
rules. If the window matches the
rules, it can perform a series of
actions on that window. For example, I
can make all windows created by X-Chat
appear on all workspaces, and the main
Gkrellm1 window does not appear in the
pager or task list."