Blueh I would appreciate it if someone changes the tags page by a vertical listing, traditional style ?
The tags are styled as a list of LI elements with the following CSS:
.TagTiles > li {
float: left;
width: 50%;
}
Just removing these settings already makes it a vertical listing as you are looking for. To do so, just enter the following into Administration > Appearance > Custom Styles:
.TagTiles > li {
float: none;
width: auto;
}
Voila, here you have it. With a little more experimenting with CSS, you can style the page further.
One suggestion: If you use Firefox, click on any element of the page you want to analyse (or test changes) and right click on Inspect Element. Read more about the Page Inspector. For other browsers look here.