Not really a guide - but you can review these:
Check out the following Microsoft Dynamics NAV demos to become more familiar with some of the new features built into the product and how you can put them to work for you.
Microsoft Dynamics NAV Demo- SP1 Fixed Assets Feature (Part 1 of 2)
http://www.youtube.com/watch?v=XIR8FawrC1k
Microsoft Dynamics NAV Demo- SP1 Fixed Assets Feature (Part 2 of 2)
http://www.youtube.com/watch?v=3BlP30a0fkw
Microsoft Dynamics NAV Demo - SP1 – Introduction (Part 1 of 3)
http://www.youtube.com/watch?v=DA2awfgki3I
Microsoft Dynamics NAV Demo - SP1 – Introduction (Part 2 of 3)
http://www.youtube.com/watch?v=HVRTCno1-3Q
Microsoft Dynamics NAV Demo - SP1 – Introduction (Part 3 of 3)
http://www.youtube.com/watch?v=pmYMSK_OkI0
Microsoft Dynamics NAV Demo – SP1 – Payables Feature (Part 1 of 3)
http://www.youtube.com/watch?v=r6bYk_8-gnI
Microsoft Dynamics NAV Demo – SP1 – Payables Feature (Part 2 of 3)
http://www.youtube.com/watch?v=bGTjYdXegiw
Microsoft Dynamics NAV Demo – SP1 – Payables Feature (Part 3 of 3)
http://www.youtube.com/watch?v=ZJLxR-iKxaU
Microsoft Dynamics NAV Demo – SP1 – Role Centers Feature (Part 1 of 2)
http://www.youtube.com/watch?v=NTGeMnxHlDA
Microsoft Dynamics NAV Demo – SP1 – Role Centers Feature (Part 2 of 2)
http://www.youtube.com/watch?v=0GyE4iorf4k
Microsoft Dynamics NAV Demo – Manufacturing / Post-Production
http://www.youtube.com/watch?v=EOmTP_AyCtE
Microsoft Dynamics NAV Demo – Manufacturing / Post-Production
http://www.youtube.com/watch?v=EOmTP_AyCtE
Microsoft Dynamics NAV Demo – Receivables Features (Part 1 of 4)
http://www.youtube.com/watch?v=hGvhOb_4PiQ
Microsoft Dynamics NAV Demo – Receivables Features (Part 2 of 4)
http://www.youtube.com/watch?v=2h4TmkPocSo
Microsoft Dynamics NAV Demo – Receivables Features (Part 3 of 4)
http://www.youtube.com/watch?v=IowqXYYH-LI
Microsoft Dynamics NAV Demo – Receivables Features (Part 4 of 4)
http://www.youtube.com/watch?v=GhyQrG_QM9U
Microsoft Dynamics NAV Demo – Reporting Features (Part 1 of 3)
http://www.youtube.com/watch?v=rIG9UQk_2B4
Microsoft Dynamics NAV Demo – Reporting Features (Part 2 of 3)
http://www.youtube.com/watch?v=Fktyw_XMvJc
Microsoft Dynamics NAV Demo – Reporting Features (Part 3 of 3)
http://www.youtube.com/watch?v=hm1N0BDkNb8
Microsoft Dynamics NAV Demo – Manufacturing / Sales Order Pre-Production (Part 1 of 3)
http://www.youtube.com/watch?v=3RQuD6Psp5E
Microsoft Dynamics NAV Demo – Manufacturing / Sales Order Pre-Production (Part 2 of 3)
http://www.youtube.com/watch?v=Qus-e0DMhvM
Microsoft Dynamics NAV Demo – Manufacturing / Sales Order Pre-Production (Part 3 of 3)
http://www.youtube.com/watch?v=iSYzMYgYgIU
Microsoft Dynamics NAV Demo – Receivables Features (Part 1 of 4)
http://www.youtube.com/watch?v=hGvhOb_4PiQ
Microsoft Dynamics NAV Demo – Receivables Features (Part 2 of 4)
http://www.youtube.com/watch?v=2h4TmkPocSo
Microsoft Dynamics NAV Demo – Receivables Features (Part 3 of 4)
http://www.youtube.com/watch?v=IowqXYYH-LI
Microsoft Dynamics NAV Demo – Receivables Features (Part 4 of 4)
http://www.youtube.com/watch?v=GhyQrG_QM9U
Microsoft Dynamics NAV Demo – Reporting Features (Part 1 of 3)
http://www.youtube.com/watch?v=rIG9UQk_2B4
Microsoft Dynamics NAV Demo – Reporting Features (Part 2 of 3)
http://www.youtube.com/watch?v=Fktyw_XMvJc
Microsoft Dynamics NAV Demo – Reporting Features (Part 3 of 3)
http://www.youtube.com/watch?v=hm1N0BDkNb8
Microsoft Dynamics NAV Demo – Manufacturing / Sales Order Pre-Production (Part 1 of 3)
http://www.youtube.com/watch?v=3RQuD6Psp5E
Microsoft Dynamics NAV Demo – Manufacturing / Sales Order Pre-Production (Part 2 of 3)
http://www.youtube.com/watch?v=Qus-e0DMhvM
Microsoft Dynamics NAV Demo – Manufacturing / Sales Order Pre-Production (Part 3 of 3)
http://www.youtube.com/watch?v=iSYzMYgYgIU