Hi Arthur,
I do fax to and from my Treo 650 with My Fax.com. Sent faxes goes to email as a PDF attachment which I get on my Treo using VersaMail. Once downloaded, I use Docs to Go ver8 (dataviz.com) and read my faxes. You can also send a documet from your Treo (or card) by attaching it to an email and sending it to the fax number addressed like
1XXXxxxXXXX@myfax.com. Be sure that you add your Treo's mail account in your profile on MyFax.com. Cost is $10 monthly for MyFax and I have a toll free fax number.
Good Luck,
Target