1. GPRS is a method of sending / receiving data. WAP is a standard for displaying Web sites on WAP-enabled devices. Yes, you can use GPRS to view WAP sites.
2. There are many free POP3 mail clients (programs) that can be freely downloaded and used on any device using the Palm operating system (such as the Treo). These will allow you to dierctly access your ISP's POP3 mail server.
3. That is the simplest way - use Blazer to access your ISP's webmail site.