$ cat geektool.sh
#!/bin/bash

wget -q http://www.tdbimg.com/ext/rss/cheatsheet/rss_cheatsheet.xml -O - |
# Convert xml into text.  Set TZ to our time offset.
        awk -v TZ="$(date +%:z)" -v RS="<entry>" -v FS="\n" 'BEGIN {
        # Convert [+-]HH:MM into an integer value in seconds
        split(TZ, A, ":");
        if(A[1] < 0)    OFF=((A[1]*60) - A[2])*60;
        else            OFF=((A[1]*60) + A[2])*60;
}

NR>1{   # Fix those pesky embedded tags
        gsub("&lt;", "<", $0);  gsub("&gt;", ">", $0);
        # Loop through each line, looking for the ones we want
        for(N=1; N<=NF; N++)
        {
                if($N ~ /<(title|summary)/)
                {       # Strip out tags
                        gsub(/ *<[^>]+>/, "", $N);
                        print $N
                }
                else if($N ~/<updated/)
                {       # Strip out tags
                        gsub(/<[^>]+>/, "", $N);
                        # Convert from YYYY-MM-DD to YYYY MM DD etc.
                        gsub(/[-T:Z]/, " ", $N);
                        # Convert from UTC to local time
                        print strftime("%F %T", mktime($N)+OFF);
                }
        }

        printf("\n");
}'

$ ./geektool.sh
Quake Hits Off Japan Coast
2011-09-16 14:30:00
No tsunami warning issued.

Microsoft to Kill Windows XP
2011-09-16 14:25:00
Will not extend support beyond April 2014.

Pitt Felt 'Pathetic' While Married to Aniston
2011-09-16 13:17:00
Dishes on relationship to 'Parade' magazine.

29 Protesters Killed in Syria
2011-09-16 11:47:00
Most violent day in weeks.

Clinton: Women Can Rescue the Economy
2011-09-16 11:04:00
Delivers declaration at APEC summit in San Francisco.

Fall TV Is a Step Back for Women
2011-09-16 10:56:00
Despite more female producers, directors, actors.

Abbas to Seek Palestinian State
2011-09-16 10:21:00
At U.N. Security Council.

Police Pressure Guardian to Reveal Sources
2011-09-16 10:17:00
Threaten paper with espionage law.

Two Men Use Dead Friendâs ATM
2011-09-16 08:40:00
Drive around with corpse, use his cash at strip club.

Congress's Ratings Hit Record Low
2011-09-16 08:30:00
Just 12 percent of Americans approve.

Rogue Trader Charged With Fraud
2011-09-16 07:42:00
After losing $2B in unauthorized trade.

New Dolphin Species Discovered
2011-09-16 07:09:00
In Australian bay.

Rogue Trader Told Bank of Error
2011-09-16 05:16:00
UBS hadn't detected the $2B loss.

Casey Anthony Must Pay $97K
2011-09-16 05:14:00
To reimburse law enforcement for search.

FAA Shutdown Averted
2011-09-16 05:10:00
Thousands would have been furloughed Saturday.
$