Why is the graphical theme of my blog not used for the comment page?
Why do my posts show the time posted, but not the date?
Answer: Settings -> Formatting -> Timestamp Format
Can I use custom CSS styles in my posts?
Answer: Edit -> Layout HTML. There are inline CSS definitions. I'll post an example here if I get around to changing anything.
Why is there no "Contact Me" widget on Blogger? There is on Wordpress. Google search suggests various third party sites you can use to insert a contact form, but I don't want to bring yet another party into the picture.