Questions about AE Simultaneous 802.11n

I have an AE simultaneous 2.4/5ghz router (firmware 7.5) as well as an Express (FW 7.4.2) extending the network downstairs.
The AE has 2 HDDs plugged in via Hub and the AX has a printer and speakers in it. I understand the HDDs will just be slow on the USB, but they seem to work pretty well - surviving suspends and such gracefully. Same with the printer.
So far things have been running along till the last day or so. Any answers or help would be appreciated:
1) Just curious, with 2 iphone 3Gs on the network and two Macs, Can the AE connect the iphones at 802.11g while preserving the speed of the 802.11n macs, or does the network all slow to 802.11g speeds (The macs are connectd on 5ghz, the iphones on 2.4 of course)
2) I turned on one account in the MobileMe "back to my mac" stuff on the AE (not the A Express) and suddenly my network would just drop off randomly and I couldn't see the AE in the Airport utility, or I could see it, the light was green, but I still couldn't connect to the net. In both cases I had to reset/powercycle the AE. Anyone else noticed this kinda behavior related to the MobileMe "back to Mac" login stuff on the AE? Turning it off seems to have stabilized the router.
3) Anyone seen the MobileMe Backup Utility cause issues with Airports? The Backup hung up last night during its run and caused me to power cycle the router. Just wondering if Backup might have been that issue, or if maybe it was related to #2s issue.

dead thread.

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