smart Rich Text Editor to simplify the process of creating plain text emails
consistent implementation of drag & drop (moving emails between folders)
label messages
latest
read/unread
spam/no spam
replied/forwarded
automatic recipient lookup in personal address book when creating emails
support for visually representing emticons
automatic querying of new emails for the configured accounts
support for email signatures
support for (theoretically) unlimited email accounts
Feeds module
support for atom/rss feeds
automatic querying of latest feeds
label news
read/unread
and more. The roadmap shows IMAP/Exchange support, multi user support, email filters, virtual folders, contact management, Task-lists, instant messenger and calendar.