I have to say for the SD card I often just plug it in to the device.
More often than not though I have a NAS at home and use ES Explorer to browse the shares on my network and copy files that way - unless it's something particularly large.
I guess your otg cable should be here by now though
Did you consider to share folders on your PC and access them trough the "network" capability of your File Manager app (File Manager HD and ES File Expert do the job quite well)? Doing so, when you're at home (or even ouside your home if your router allows it), you don't need any cable nor (drop)box nor usb-otg-capable-cable and it's (I think...) a flexible way to access (and manage) your centrally stored files.
Tell us if it helps...
Thanks mpattenden and bennybuche.
I have some comments:
1) I am trying to set up FIle Manager HD for "network" capability but I didn't managed: On my Windows-7 PC I shared a folder, then I tried to set up the network connection in File Manager HD (one of the configuration options from the drop-down menu at the upper-right corner). I choose "search" (the local network), it finds the IPs for the active PCs in the net but clicking on the appearing icons produce a conection error. Any clue about this error?
2) I am considering the option of installing a NAS drive. What's the recommended Android client application for that service?
I've tried to connect my tablet to the PC using "File Expert"... and it works!! I don't know why "File Manager HD" doesn't.
On the other hand, the bad point is that "File Expert" doesn't see the "\mnt\sdcard2" device and I cannot copy directly my PC files to the sdcards2 (I need 2 steps): !!Nobody is perfect!!! (But some gadgets less than others ;-).