Thanks spurious,

Adding multi-LUN support did the trick.

For those who don't want to use root account for such a trivial task as mounting removable media it might be helpful toadd following (or similar) lines in /etc/fstab.

Code:
/dev/sdc1               /mnt/SM                 auto    noauto,owner,user  0 0
/dev/sdb1               /mnt/MMC                auto    noauto,owner,user  0 0
I'm using SanDisk 6in1 reader with SmartMedia and SD/MMC cards only. For different types of readers the order of card slots might differ but testing with all drive letters helps.

Naturally this works only if you are using only one portable media or always insert devices in the same order.