You can change the appearance of the Blog entry titles by adding class selectors to the ViewBlog.ascx and then adding the classes to skin.css in the skin folder.

Edit as follows (around Line 36):

<td nowrap colspan="2">
<asp:HyperLink id="lnkEntry" runat="server" CssClass="BlogEntryListTitle">
<%# DataBinder.Eval(Container.DataItem, "Title") %>
</asp:HyperLink>
</td>

Now you also have to add selector to class in skin.css, like this:

a.BlogEntryListTitle {}