maybe we can use http://i.moltalk.org/
instead of CSU
cause, sometimes CSU is not working.

Also, Moltalk will be quicker and more details.

choose "Find interface between two chains of a structure" in http://i.moltalk.org/
enter the pdb code,
when select chains, just select the same chain twice.

Done.

use
http://balabio.dcs.gla.ac.uk/tops/
to generate
http://www3.ebi.ac.uk/tops/ExplainDetailed.html
and you can easily compare things like

1bia

1gh4

CSU for 1A2P
ChainA Strand1

Contacts of ILE 96 (chain A) in PDB entry 1A2P

For calculating Hydrogen Bond

HBPLUS, which is distributed with LIGPLOT: http://www.biochem.ucl.ac.uk/bsm/ligplot/ligplot.html

There's also HBOND, which comes with the JOY package:
http://www-cryst.bioc.cam.ac.uk/~joy/

they are free, but they all need Academic License which I can't apply individually, has to apply by UMDNJ.

for example, I want to know the H-Bonds in protein 1a2p, I go to

http://bioportal.weizmann.ac.il/oca-bin/csu?PDB_ID=1a2p

I found there's four sheet strands for each chain.
I click on "Strand 1" on "A sheet" (residue 96-99)
I'll go to this page
from this page, if there's a "+" sign under HB colume, I know there's a H-Bond.

Virtual Stock Simulation/Game/Practice

free
http://game.marketwatch.com/Home/default.asp

fee need
http://www.stocktrak.com/

track flight
web based
http://www.flightexplorer.com/
http://www.flightview.com/TravelTools/default.asp
http://www.flytecomm.com/cgi-bin/trackflight
http://dps1.travelocity.com/dparrqst.ctl?Service=TRAVELOCITY

Software
AirNav
Jacars
Wacars

for Taipei, Taiwan's Aerial image, I use
this one as whole taiwan
http://921farmers.cultureworld.org/image/TaiwanNo1.jpg
+
this one for more detail image
http://iws.csrsr.ncu.edu.tw:8080/JSP/CSRSR/homepage.jsp?UserId=guest
+
this one for very very detail image
http://addr.tcg.gov.tw/

http://www.globalsecurity.org/military/world/taiwan/taipei.htm
this one as black and white detail