Hello,
As Joe says, all of the tutorials here will apply to version 5. Version 5 has just introduced an additional way of skinning a few enhancements, none of them are necessarily easier or better.
If you are new to skinning I would suggest you begin with to get to grips with skinning. After that there are tutorials on CSS skinning and I would also recommend you view
DotNetNuke ASCX Skinning for Professional SkinnersThis shows the methods to use for skinning the fastest and most efficient.
In the October issue I will be releasing some videos on how to package skins for DNN5 as these are slightly different, but, packaging a skin in the DNN4 format is still readable in DNN5 - and is actually easier - but you can look into that when I release the tutorial in October.
Thanks,