Here´s an informative snip:

10) What have been the biggest stumbling blocks over the last few years in getting Fallout 3 made?

[Urquhart, Feargus] The biggest thing has really been resources and time. We did start Fallout 3 in early 1999, but things were not moving forward that quickly. Plus, we needed to get another project out relatively soon because of Interplay´s financial situation. So, the Fallout 3 team became the Icewind Dale team. We had then hoped to start Fallout 3 after Icewind Dale was completed, however at that time both Chris Parker and I had to jump in and spend pretty much every waking moment on Baldur´s Gate 2 until it shipped in late September of 2000. Since we were going to be very busy and not able to help a Fallout 3 get started, I decided to have the team work on the Heart of Winter expansion. Since the team completed that in February of this year, they have been working on the miscellaneous projects - but have started thinking about Fallout 3. Plus, a lot of people have been transferred over to work on TORN to help that get done as quickly as possible.

In other words, we´ve had to make a lot of decisions to get projects out the door that have made it hard to get Fallout 3 moving forward.