I was looking through the code in facebox.js(a jQuery plugin) and I saw this:
'\
<div id="facebox" style="display:none;"> \
<div class="popup"> \
<table> \
<tbody> \
<tr> \
<td class="tl"/><td class="b"/><td class="tr"/> \
</tr> \
<tr> \
<td class="b"/> \
<td class="body"> \
<div class="content"> \
</div> \
<div class="footer"> \
<a href="#" class="close"> \
<img src="/facebox/closelabel.gif" title="close" class="close_image" /> \
</a> \
</div> \
</td> \
<td class="b"/> \
</tr> \
<tr> \
<td class="bl"/><td class="b"/><td class="br"/> \
</tr> \
</tbody> \
</table> \
</div> \
</div>'
Wow, I am ashamed I didn't know you could do multi-line strings like this earlier!! Although not as nice as multi-line strings in Ruby/Python/Perl, this definitely beats quotes and plus signs.