I've always found that font to be pretty terrible and makes Latex docs look less professional, but I guess if you are used to it from reading papers, it's the opposite.
Actually, it's just a standard WordPress blog using the Latin Modern Roman typeface, which is based upon Computer Modern, the default in [La]TeX.
(I dig the TeX-lookalike WP theme, but it should really use other @font-face formats for compatibility, e.g., WOFF and EOT; that might make it look better in other browsers.)