Importing data columns of unknown length

Hi all,

First off, R2011a. If there is an answer to this question already, I have not been able to find it (I'm probably searching for the wrong thing). I want to perform the same action as when you right click on a text file in the directory and import it using the wizard, setting up a vector for each column header. For example, from the following text document,

https://dl.dropbox.com/u/45571035/swb%20sample.txt

I want 3 vectors; Sweeps, Strain, and Temperature. I want to use the same script for multiple files, performing several calculations, plotting, etc. However, each file may have a different number of rows. I have used the uiimport, but I would like to set up something that requires nothing but hitting F5.

Thanks for any input and let me know if anything else is needed.

Sam