Downstrokes
http://guitartricks.com/tutorial.php?input=409
Metal Rhythm series
http://guitartricks.com/tutorial.php?input=231
http://guitartricks.com/tutorial.php?input=264
http://guitartricks.com/tutorial.php?input=319
http://guitartricks.com/tutorial.php?input=360
http://guitartricks.com/tutorial.php?input=412
http://guitartricks.com/tutorial.php?input=477
Here's a tutorial on how to actually use sweep picking. This should really help you out.
Sweep picking applications
http://guitartricks.com/tutorial.php?input=408
As far as Jazz goes, Bobby Howe, Christopher Schelgel, Hanspeter Kruesi and Gavin Audagnotti all have good tutorials on different topics. Try looking at their instructor page and look at their Tutorial list.
Hope this helps.