I get it too sometimes. Haven't figured out why, but it doesn't seem to happen if my battery is charged sufficiently. It looks like if the battery is/gets low enough then resume from sleep gets unpredictable. Almost like it failed to automatically go into hibernate or something. I also switch between different power profiles so I'll try to keep an eye on which settings are more likely to cause this as well. BTW, I'm using the 120 HDD, not the SDD, and RC 7100.
Mini 10v | Atom N270 | 60GB OCZ Vertex SSD | 2 GB RAM | Webcam | Bluetooth | Win 7 Build 7100
Mini 9 | Atom N270 | 16GB SSD | 2 GB RAM | Webcam | Bluetooth | Win 7 Build 7100 (SOLD)
Latitude E6500 | Core 2 Duo P9500 | 250GB SATA | 4 GB RAM | Webcam | Bluetooth | Win XP SP3