Thanks to guys with nicknames Disabler and smith, LeechCraft is proved to run on Nokia N900. Disabler made it run on N900 with Ubuntu installed, while smith worked with native Maemo installation.
Of course, the interface is not adapted to finger-based manipulations, stylus is required to work with LeechCraft, but this proof-of-concept shows that LeechCraft can run there at all, so after some UI adaptation we would have another supported platform :)
If you want to try LeechCraft on N900 with Ubuntu, you can install Qt 4.7.1, QXmpp and LeechCraft from the deb packages. Icons ans shortcuts for Hildon are also available — that archive should be unpacked into