It seems that I may talk about Toyota almost endlessly, so forgive me for putting so much emphasis on them. This thread may be an "official" Toyota thread for 2007.

So far Toyota has had problems mostly in three areas.
1) New seamless gearbox that continues braking down. They decided to prefer it in co-operation with Williams, but in Toyota it still isn't working properly. This has been the main detail in their winter testing that has caused unreliability issues.

2) Lack of grip, also related with suspension. That might be a bit surprising as Toyota's suspension is one of the most innovative ones and Vasselon is mainly know as suspension specialist, but as has been said before - innovation may pay off and give advantage, but also may not. And this is ironic, because people have wanted Toyota to be more innovative and now look what happened. :

3) Lack of downforce at the front end - that's why they have recently tested their new front wing.

Last time at Jerez after a long time there came some spark of optimism from Toyota's camp. They ran their Melbourne-spec aero there. Maybe they should have tested more than two days there (Thursday and Friday) - they should have the resources to do that. Last news from yesterday are that Jarno is in slight fever. Trulli's fastest lap on March 9 was more than a second faster than the overall fastest lap at common testing in mid-February also at Jerez, but that can be explained with two factors: 1) higher temperatures in early March, 2) cars were more "green" in February than they are now.