Incorrectly displayed links tooltips and incorrect fonts

Steps to reproduce:
1. Go to http://javatalks.ru/.
2. Hover mouse over the links 'Articles', 'Offline conference' and 'Jtalks opensource' at the top left corner.

AR: Truncated tooltip. Tooltip is overlapping other items.

ER: Tooltip should be displayed correctly under the links.

Note!
Continue from the 1 step.

3. Click on any topic (e.x. the first one) to open.

AR:
1. Inconsistency between font sizes in strings "Posts", "Views", "Last message" at topics table.
2. Inconsistency between fonts of '<' and '>' characters and page numbers.

ER: All fonts should be displayed correctly.