I agree that a CF port would be more useful, since you can use that for wireless networking, but you can't with SD (unless it is SDIO..which this wouldn't be, right?)
What would be ideal would be to attach a wireless network device and add a several-gig pcmcia HD to the thing...
EDIT:
Wait, come to think of it, how many GPIO pins would we need to add a USB host chip to it?
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Searched around for a CF modding, and did find some sites doing that but it was done on a iOpener appliance or something. Runs linux!
As for pcmcia hd, I'm gonna receive a Kingston 5GB pcmcia drive this week, so its going to add some space to the SL4!
Conversely, you can also add a pcmcia<->IDE adapter
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Should be good to add a notebook hdd. Though it could strain the batteries a bit! ... but it does open up the possibility of accessing a CDROM/DVDROM drive etc!
I'm totally with adding a USB host chip! Now that would be really good! And if a wireless card can be hardwired to it, I dun mind rigging up one of the cheap 802.11b pccards to do it! ... ie if someone can point to the How-Tos ... that should free up the pcmcia card for storage.
Back to USB host ... that would be sweet! And in linux, driver support would be so much easier! ... I'm currently running my SL4 on CE.NET 4.1 for the timebeing ... ... though I've been flashing it to try out the different builds. ahh ... if only I gotten two from ze Bay recently, then I can use 4.1 while testing out the new opensimpad builds!