「as to」と「as for」の違いは何?

There are two phrases with "as" that you might come across in a business email: "as to" and "as for".

Some sources, including the American Heritage Dictionary of Idioms, say they have the same meaning. I think they are often used differently, though.

• "as to" <- to precede an answer to a question or reply to a comment.
  
• "as for" <- to state the topic which the main sentence is related to

As to what I was up to over the weekend, I went to a performance at SuperDeluxe in Roppongi. <- "what I was up to" could be seen as a question

http://www.super-deluxe.com/

It's a good venue to see interesting music. I see a show there about once every two or three months.

• 開催地 (かいさいち) (n) place where a meeting (conference, etc.) is held; venue; (definition from Edict)

The weather wasn't good, but as for the performance, it wasn't bad. It was improvised music on laptops by a trio called Fenn O'Berg. You can listen to some of their music here:

http://www.zero-inch.com/artist/Fenn_Oberg

As for this post, that's it. There will be another post tomorrow!