SoftMaker are a small German developing company that specialize in making Office Suite apps. They're about ready to release a new port of their SoftMaker Office, and finally Android is going to get a decent Office Suite.
It might sound rude, but this is honest to god the best full Office clone out there. I've tried 4 different office apps for Android, and they were all quite limited in the file formats supported and in their abilities. SoftMaker Office is, almost literally, a complete Office clone. It is that good.
I last used the Windows CE version of TextMaker, the Word app, and it had every single feature that I used in Open Office. It had support for every file format I might want including DOCX. And it was fast, too; I tested it on a 6 year old gadget running on a 400MHz CPU. It responded darn near as fast as my laptop.
And they're promising support for Android v1.6. What more could you want?
via SoftMaker Blog