in 2010 i use Lyx to create some assignment on my college, and i feel unsatisfied with the result when i create an PDF output.
after googling on the internet. i found some few tips when using Lyx as LaTex Editor :
- change the TeX encoding to default (because the default value is OT1, which don’t used embedded font).
- always defined the font size.
- always set the Float Placement to Here Definitely.
- always set the default paper to A4, because LyX use letter paper by default.
thats all i hope it helps
Bopbi's Mind 
lyx is very helpful to write papers dan reports, and even books. but too bad they don’t give templates for latex so i have to write the dissertation with doc :(
iyah sih, ga bisa kaya buku-buku luar negeri gt bentuknya kaya terbitan apress ato pragprog. hehehehe