Okay, this isn't a question, please remove it if it is unwelcome, but more of a wiki post. Here are the default values for new css classes for themes in 1.5; just copy these to the bottom of your qa-styles.php file and tweak them as you like.
.qa-activity-count {font-size:150%;}
.qa-activity-count-item {margin:0.25em 0;}
.qa-activity-count-data {font-weight:bold;}
.qa-c-item-expand {display:block; color:#666; font-style:italic; margin:4px 0;}
.qa-favoriting {float:right; margin-right:48px; margin-top:4px;}
.qa-favorite-image {background:url(favorite-plus.png) no-repeat; background-position: 0 -26px; border:0; margin:2px; height:26px; width:26px; vertical-align:middle; display:inline-block;}
.qa-favorite-button,.qa-favorite-hover,.qa-unfavorite-button,.qa-unfavorite-hover {background:url(favorite-plus.png) no-repeat; border:0; height:26px; width:26px;}
.qa-favorite-button {background-position: 0 -26px;}
.qa-favorite-hover,.qa-favorite-button:hover {background-position: 0 0px;}
.qa-unfavorite-button {background-position: 0 -52px;}
.qa-unfavorite-hover,.qa-unfavorite-button:hover {background-position: 0 0px;}
.qa-notice {background:#fdd; border-bottom:2px solid #293d39; color:#b00; font-size:18px; padding:.5em 32px; font-weight:bold; position:relative;}
.qa-notice-close-button, .qa-notice-close-hover {font-family:"Arial Black"; color:#c00; font-size:20px; background:none; cursor:pointer; position:absolute; height:24px; border:none; top:4px; right:6px}
.qa-form-tall-suffix {font-weight:normal; font-size:10px;}
.qa-q-item-buttons {text-align:right; clear:both;}
.qa-q-item-content {font-size:10px; margin-top:6px; max-height:64px; overflow-y:auto; padding:4px; border:1px solid #ccc;}
.qa-q-item-flags {background:#f00; color:#fff; font-weight:bold; padding:2px 5px; display:inline-block;}
.qa-q-view-closed {font-size:13px; margin-bottom:18px; font-style:italic;}
.qa-q-view-closed-content {font-weight:bold;}
.qa-q-view-extra {font-size:13px; margin-bottom:18px; font-style:italic;}
.qa-q-view-extra-content {font-weight:bold;}
.qa-related-q-list {list-style-type:none; padding:0;}
.qa-related-q-item {margin:0.5em 0;}