This experimental plugin provides some help with the definition of 
functions that should be called when the cursor position changed.

When the cursor position changes, it first checks if a certain condition 
is met and then calls functions registered in 
b:hookcursormoved_{MODE}_{CONDITION} (an array).

In order to define new conditions, you have to set the variable  
"g:hookcursormoved_{CONDITION}" to a function name (STRING). This 
function takes the current mode (i .. insert mode; n ... normal mode) 
as single argument.

Functions are best registered using |hookcursormoved#Register()|.
Example: >

    function! WhatsGoingOn(mode) "{{{3
        if mode == 'i'
            DoThis
        elseif mode == 'n'
            DoThat
        endif
    endf

    call hookcursormoved#Register('syntaxchange', function('WhatsGoingOn'))



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Status:  Works for me (there may be some minor quirks)
Install: See http://github.com/tomtom/vimtlib/blob/master/INSTALL.TXT
See http://github.com/tomtom for related plugins.