Thanks to Justin Moore’s post  I discovered that Gmail  is now offering IMAP access , for free, to regular Gmail accounts! It’s been rolled out to my Gmail account but so far, I checked one domain that’s a part of Google Apps for Domains  and the option is only there for POP3 access still. No idea if the IMAP feature  is coming to the Google Apps service or if it’s a Gmail-only thing.
I jumped on the opportunity to add Gmail as an IMAP account to VersaMail on my Treo 650. But when looking for the necessary server settings, I discovered this sad news : “Palm handheld users: please note that Gmail IMAP access is not currently compatible with VersaMail.” Oh well. I was happy for a couple of minutes. I’ll probably stick to the web interface all around, but it’s nice to know IMAP is an option since there is a dearth of free email services supporting IMAP (Gmail is the only major one that I know of).