My main got-to-have apps for OS 2008:

• Evince (reading ebooks - pdf, djvu)
• Basilisk II (running many Macintosh programs)
• TiEmu 2 (like having my TI 89 Titanium on my N800)
• UKMP (for playing music, and listening to podcasts/lectures)
• Media Player (For watching my converted DVD movies)

But also a whole lot more. (Big thanks to all the developers!)