SharePoint and _x0020_ ??

I usually found that display names and internal names in SharePoint appeared differently. I found that a space on the display name would be replaced by _x0020_ in the internal name. Likewise a ':' would be replaced with _x0030_

Usually when i was switchin between the 2 in code references, i would do a String.Replace to do the conversion....
if only i had seen this post ages ago!!!
SharePoint 2010 escape characters