this is better http://www.bareknucklesoftware.com/

ImageWrangler:
Pros: Installation is easy.
You can use many viewers.
You can change directories fast.
Cons:
It is not free ($30) and has trial demo.
You Cant see any preview.
You cant convert to any format.
Managing files is not easy.

iQuence:
Pros:
You can see beautiful previews.
You can convert your sequences to RGBA movie files.
It is free.
You need to select root directory, it automatically finds All sequences in subdirectories.
Cons:
You cant use fcheck or framecycler (In this version)
Installing shake is neccecery.

And keep in mind that iQuence is in it's beta. next final version will support fcheck and nuke and also you don't need any external program to convert files. So I think iQuence is more advanced.
I only release this version because I want to see the main functionality of iQuence. version 1.2 will be more advanced and will be release soon.