I'd like to see some hex dump data based on segmet:[offset] schema but when i "Go to" "Expession" in "Hex Dump" window and type for ex. DS:[ESI] or DS:[EAX+2] or ES:[EDI] i have the message "No memory on the specified address" but i have deffenetly valid addresses there. Is it possible to access memory in this way and if yes then how?

hmm works for me... odd that it isn't working for you.

Well, You can try using the commandline plugin included with Olly, but I recommend the commandbar plugin though. It sits at the bottom of the Olly window making it always accessible. I'm sure you can find it on the stuph page

in the command line type:
"d ds:[ecx]" without the quotes of course.

That will show address located at ds:[ecx] in dump window.
works for the others as well

Thanks Gabril
it is good to hear from you again