Here are some line suggestions for Coach Murray
Note: There isn't really a "Fourth Line" here.

Current (With Spezza out for injury)

Dany Heatley - Bryan Smolinski - Daniel Alfredsson
Peter Schaefer - Mike Fisher - Chris Neil
Chris Kelly - Antoine Vermette - Patrick Eaves
Christoph Schubert - Vaclav Varada - Denis Hamel
Healthy Scratch (HS): Brian McGrattan unless playing Leafs, etc...

With Spezza back

Dany Heatley - Jason Spezza - Daniel Alfredsson
Peter Schaefer - Bryan Smolinski - Mike Fisher
Chris Kelly - Antoine Vermette - Patrick Eaves
Christoph Schubert - Vaclav Varada - Chris Neil
HS: Brian McGrattan

When Havlat gets back:

Dany Heatley - Jason Spezza - Daniel Alfredsson
Peter Schaefer - Martin Havlat - Mike Fisher
Chris Kelly - Antoine Vermette - Patrick Eaves
Vaclav Varada - Bryan Smolinski - Chris Neil
HS: Christoph Schubert, Brian McGrattan