Some oral presentations I really enjoy, some I really don't. It really depends on
1) whether I find the topic interesting
2) my familiarity with the topic
3) length (more an issue if 1 and/or 2 are not in my favour)
4) whether I have to memorize it (more of an issue the less familiar I am with the topic)
It's fun to give a presentation on a topic I like, and that I know really well. It's not really fun to give a presentation on a topic I dislike and know nothing about.
So for intstance, I would like doing presentations on topics like the Israel/Palestine conflict, the Russian Revolution, social housing, opposing the 2010 olypics, the economic crisis, ect. On the other hand, I would not enjoy giving a presentation on any business topics.