InfoPath and Designer
A good video lead in to using SharePoint Designer and InfoPath by Asif Rehmani – I found this very clear and useful, stick around to listen to the questions and answers at the end.
Some more light reading
I have to work my way through this one – but I have seen enough to warrant returning for more https://www.nothingbutsharepoint.com/sites/eusp/Pages/default.aspx, which lead me to: http://www.asapsharepoint.com/SharePoint%20Designer/SPD_Friend_or_Foe.pdf and http://www.asapsharepoint.com
Regards, Steven Knight