Well here are my thoughts:
#1 Complete refresh to the Cinema Display line: LED-Backlit Screens with 1000:1 contrast ratio, much brighter, much higher response rate, more reasonable prices...a refresh to the lineup:
Drop the 20" - have a 23" a 27" and a 30" with the new LED-backlighting. Prices, $699, $899, and $1399
#2 New Penryn quad-core MacBook Pros with the new 45nm chipsets. Clock speeds 2.4GHz, 2.8GHz, and 3.2GHz - All LED backlit screens on the 15.4" and the 17" - possibly add a high end 19" MacBook Pro to the lineup, 1920x1200
#3 New Penryn-based iMac lineup refresh...same aluminum+black case. offer a 20" and 24", introduce a brand-new 30" iMac to the lineup. Clock speeds 2.4GHz, 2.8GHz, 3.2GHz (all quad-core)
Prices: $1199 (2.4GHz quadcore 20"), $1799 (2.4GHz quadcore 24"), $1999 (2.8GHz quadcore 24"), $2499 (3.2GHz quadcore 24"), $2899 (30" quadcore 3.2GHz)...other variations and prices possible.
#4 New Apeture release (as previously mentioned)
#5 Possibly refresh to Mac Mini sporting a 2.4GHz Core2 Duo, larger hard drive (200GB or 320GB), maybe featuring a better video card (dual-link) to drive a 30" display
#6 MacBook - update processors to 2.4 and 2.8GHz, same price, add an SSD option
...just a few ideas of things that would be great