tl;dr A live demo
Hi,
Seems like everyone is willing to see an excel export implementation :) I'm sure there are people know how to export to xls better than me. Anyway, I'll propose the steps below.

Build an XML tree.
Why? - Because if you create an xml, it's easy to convert it ~~xml~~ xls. Xls file is a base64 encoded xml file actually.
How? - Every browser is a xml parser already because they parse HTML, a kind of XML. Here is the snippet to create a simple excel-like XML file using jquery:

//create root of xml
$root = $('<xml/>');

//create a workbook
$workbook = $('<ss:Workbook/>').attr({
    "xmlns:ss":"urn:schemas-microsoft-com:office:spreadsheet", 
    "xmlns:x" :"urn:schemas-microsoft-com:office:excel",
    "xmlns:o" :"urn:schemas-microsoft-com:office:office"
});

/*
* Add other elements here
*/

//add workbook to root
$root.append($workbook);

//retrieve full xml string
alert($root.wrap($('<div>')).parent().html())

Now convert it base64 format and append required headers
Why? - As I said above, xls file is a base64 encoded xml string.
How? -Simple: Using web toolkit's small script will suffice. Just one line:

xlsObject = 'data:application/vnd.ms-excel;base64,' + Base64.encode(testXML);

Just say document to download it.
Why? - To download.
How? - like this:

document.location = xlsObject

Prettified xml file and result

Edit: typo corrected

Export #58

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