When I started to edit bib-databases I used phybiliographic to enter the major part of the information. It does a good job and ha sa nice GUI. At some point I ran into troubles like having to enter more than one author to enter or changeing the commands for URLs. In that case I open the file with Kile and edit the details manually.
Hope this helps Holger -- Debian testing/unstable, build from Knoppix 3.2 Lyx 1.3.1 tetex 2.0.2-4.2 kpathsea version 3.4.5
