Sum File Sizes

The tips for this week are culled from my replies to the many emails I receive asking: "How do I do such and such?"

How do I find the total size of all Photoshop files (*.psd) in my home directory?
% find ~ -iname "*.psd" -print0 | xargs -0 du -ch
15M ./Pictures/complete/ferdi-coll3.psd
30M ./Pictures/complete/ferdi-cool.psd
1.7M ./Pictures/complete/ferdi-gala.psd
...
600k ./Pictures/web-site/misc/web5.psd
72k ./Pictures/web-site/osxfaq/banner1.psd
48k ./Pictures/web-site/osxfaq/banner2.psd
96k ./Pictures/web-site/osxfaq/btn-.psd
28k ./Pictures/web-site/osxfaq/end.psd
316M total