Here is an excerpt:
" Worldwide, shipments of mobile handsets rose 27% between 2005 and 2006, while single- and dual-mode Wi-Fi sets combined skyrocketed 489%. From 2007 to 2010, mobile handset shipments will grow another 26%, Infonetics forecasts, and Wi-Fi shipments will increase by a massive 1,300%. "
source: Dual-mode Wi-Fi and cellular phones to grow
Personally I'm very eager to have a WiFi equipped BB. I use WiFi everywhere - everyday.