One of the biggest complaints about composing mail on the iPhone is that it can only be done in "upright" (portrait) mode; two-thumbed typing in the narrower screen aspect is much harder compared to working in sideways/landscape mode.
A recent 99-cent app (Touchtype) was the first to address this software limitation. Now comes Firemail, which does everything Touchtype does (and more!), but for free.
Launching Firemail and turning your iPhone/iPod Touch sideways gives you the wider screen layout for typing both subject and body text. Where Firemail steps ahead is when you hit the action key: you can either send what you’ve typed to MobileMail’s outbox OR save it as a "bookmark," to be called up at a later time. Great for signature blocks or webapps that work through an email interface.
Firemail requires the 2.0 software to operate.