Here is a list of all my Tools on right click>Tools that I use on a daily and sometimes seldom basis. This is my workflow so you can mod yours to your own liking.
NOTE Paths to the programs may differ to yours but the parameters must be the same.
1: VLC PlayerShortcut: ctrl+1/cmd+1 (I also have this as the double click function)
NAME: VLC Player
PATH: C:\Program Files (x86)\VideoLAN\VLC\vlc.exe
PARAMETER: --playlist-enqueue --one-instance "%_path%"
[✓] for all selected files
What the first code does is put all selected files in a playlist, 2nd one says only one instance of VLC player to open and the "%_path%" just points to the file.
I do this to preview the songs and sometimes rate them within mp3tag at the same time.
I got the code from the VLC players web page where it has a list of command-lines. Where you can find here http://wiki.videolan.org/VLC_command-line_help so you can mod yours to how you like.
2: Artwork - Artist/AlbumShortcut: ctrl+2/cmd+2
NAME: Artwork - Artist/Album
PATH: C:\Program Files (x86)\Mozilla Firefox\firefox.exe
PARAMETER: http://www.google.ie/images?q=$replace($regexp(%artist% %album%,'\s*\[.*\].*',), ,+)&hl=en&biw=1236&bih=1372&tbs=isch:1,isz:lt,islt:svga&source=lnt&sa=X&ei=-u1wTZTpPMK1hAeb0qkx&ved=0CAoQpwUoBA
[ ] for all selected files
This opens up firefox and searches google for 800x600px or larger images with the %artist% and %album% as the search function.
3: mp3valShortcut: ctrl+3/cmd+3
NAME: mp3val
PATH: F:\PROGRAMS\mp3val v0.1.8\mp3val-frontend.exe
PARAMETER:
[✓] for all selected files
This opens up mp3val which fixes MPEG audio files' integrity http://mp3val.sourceforge.net/
If anyone knows of a Parameter which loads the mp3 file/s into the program that would be great. At the minute ctrl+3 simply is a shortcut to open the program as quickly as possible.
Shortcut: ctrl+4/cmd+4
NAME: Open In Explorer
PATH: C:\Windows\explorer.exe
PARAMETER: /e, /select, "%_path%"
[ ] for all selected files
/e opens the explorer, /select highlights the file and "%_path%" points towards the file/s.
5: iTunesShortcut: ctrl+5/cmd+5
NAME: iTunes
PATH: C:\Program Files (x86)\iTunes\iTunes.exe
PARAMETER:
[✓] for all selected files
Only opens iTunes, but if anyone out there knows of any parameter which will loads the selected files in a playlist the would be great.
6: Mixed In KeyShortcut: ctrl+6/cmd+6
NAME: Mixed In Key
PATH: C:\Program Files (x86)\Xone Mixed In Key 4\XoneMixedInKey.exe
PARAMETER:
[✓] for all selected files
Mixed In Key software here http://www.mixedinkey.com/ puts a key to your tags in actual key or through a Camelot wheel keycode formula. I have it so that it appends the comment from "5" which I first of all do and is the rating of the song to "4A - 5" This means I can quickly identify both the songs rating and key. Also handy for creating smart playlist within iTunes and so you can rate a song 4.5 etc.. and never be afraid of losing that info. 
But again this only opens iTunes, and if anyone out there knows of any parameter which will loads the selected files in a playlist the would be great.
Hope this was of some help.