Is there a "compact" option like gmail?

[notriddle (Michael Howell)]

That’s not compact. This is compact:

.topic-body {
	padding: 7px 11px;
}

.post-menu-area {
	margin-top: 0;
}

.topic-meta-data .post-info {
    float: none;
}

.topic-list th, .topic-list td {
  padding-top: 5px;
  padding-bottom: 5px;
}

@media (min-width:900px) {
.topic-meta-data .post-info {
    float: none;
}
.post-menu-area {
    position: absolute !important;
    top: -40px;
    right: 0;
}
.who-liked {
    margin-top: 0;
    padding: 2px;
    background: #fff;
    box-shadow: 0 2px 4px #333;
}
}

At least to me, it seems like most of the empty space in Discourse is to the left of the post action bar. Hence, a compact theme’s goal is to get rid of that, while still preserving a readable line length.