0 Hz (no Doppler shift) usually means that the source and receiver are
stationary, relative to each other; almost certainly the source is on or
near Earth.  A geo-stationary satellite *could* produce that result, but it
probably would not be spikes.  A transmitter on the Moon *could* also do
this, if there even was one, and the Moon was in the Arecibo Radio
Telescope's Field of View (FOV).
	I'm guessing that you have Roelof's great little utility SETIspy:
http://www.cox-internet.com/setispy/default.htm
	Click on "Work Unit" and the SkyMap button to see if that WU is from a
part of the sky near the Equator.  Most of the geo-stationary satellites
are on the Equator.  Chances are, you have an Earth-bound source of Radio
Frequency Interference (RFI).
http://setiathome.ssl.berkeley.edu/rfi/index.html
	Sometimes, you might see a WU get returned in only a few minutes - not
because it is completed, but because the Results file just gets too large. 
This is usually due to RFI; the WU can be too "polluted" with RFI to be
useful.  Then, the client software just quits early, and sends in the
results.  You will get full credit for such a WU.
-- 
Cheers,
Red
P.S. Somewhat related, from the Fun-And-Games department: 
There is another great (and free) sky map available for SETI@home; this one
shows the Sun, Moon and other planets for the date of your WU, or any
date.  It's actually a very good computer "observatory" to learn star
positions, names, facts, et c.  Click on any star or planet for its' name
and Notes.  Most star names are Arabic, or the position they hold in a
constellation.
http://www.distantsuns.com/register_mbo.html
The Distant Suns homepage:
http://www.distantsuns.com/
	If the gray horizon covers your WU, click on Extras, then click off
Landscapes.  Plug in the WU date to see if the Moon (or anything else) was
near your WU: 
Click on View, and When-And-Where.  
Click Location, then Observatories.  
Click on the drop-down menu, and select Arecibo.
Click on the OK button that is *in the Observatories window*
The Locations window will show 18 lat. 66 log., then click OK there.
Click in the WU date, and tinker the Time box until the UTC below matches
the WU time.
(Change the time, then hit the Try button, to match UTC between the window
and WU.)
and when the UTC matches your WU,
Click OK and your WU will be shown with any planets, and the Sun or Moon
located, for that date.
--
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Barbi Satin wrote:

It ended up at 136 spikes almost all in a straight line at 0 Hz/s