ls -lt | grep 2011-10-07 | grep -v drwx | cut -d: -f2 | cut -d' ' -f2 | xargs rm

from current directory remove files modified on 2011-10-07 leaving out directories

ls -lt  -l - long list of files in current directory with atributes one file per line
    -t sorted by time

grep 2011-10-07  - select only lines with todays date

grep -v drvx     - -v exclude lines with drvx string of atributes indicating directory

cut -d: -f2  - select second field in the file list separated by ':' separator as in

    -rw-r--r--  1 daniel daniel  7115 2011-10-07 10:24 gsl_numobj.pyc

cut -d' ' -f2    - select name of the file which is the second field in line separated by ' '

xargs rm     - remove files from the list transfered to rm as the result of previous stages
           treating each word in the list as a separate argument