It can be done, but you must root your tablet.
Then you can get it to recognize the ADHOC from your phone.
Unless you want to pay $30 a month you should avoid using sprint hotspot and use the app since it is free. Rikeroleg, what version of wifi tether are you using? have you tried the wiredtether?
Can you elaborate on this dtm?? It was my understanding (and has been my experience for the past month or so) that using the Sprint hotspot hack results in no charges. Since it's so easy to apply, and provides an infrastructure access point, it seems the way to go. Thoughts?