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From: Damien Wyart <damien.wyart@free.fr>
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Subject: Re: Saving "relative point" in a paragraph or line
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* Jambunathan K <kjambunathan@gmail.com> in gnu.emacs.help:
>     (defadvice transpose-lines
>         (around transpose-lines-preserve-context activate)
>       "Transpose lines but preserve the surrounding text context."
>       ;; Add a bookmark at current char.
>       (add-text-properties (point) (1+ (point)) '(bookmark t))
>       ;; Transpose.
>       ad-do-it
>       ;; Visit the bookmark.  Assumes that the bookmark is at a position
>       ;; behind where the cursor is at the end of the transposition.
>       (goto-char (1- (previous-single-property-change (point) 'bookmark)))
>       ;; Remove it.
>       (remove-text-properties (point) (1+ (point)) '(bookmark)))

I was thinking of doing it with saving current-column, transposing,
forward-line to go back 2 lines, and move-to-column, but your approach
looks more elegant.

-- 
DW