Weather:

http://weather.msn.com/

http://weather.yahoo.com/

http://www.weather.gov.sg/wip/web/home/further_outlook

http://www.kjc.gov.my/english/weather/forecast/ship.html

http://www.weather.go.th/en/thailand.php 

http://www.tmd.go.th/en/  

http://www.weather.gov.sg/wip/c/portal/layout?p_l_id=PUB.1023.7   

http://www.windguru.cz/

http://www.wunderground.com/

http://www.oceanweather.com/data/index.html

Tides:

http://easytide.ukho.gov.uk/EasyTide/EasyTide/index.aspx

General shopping (see also address list):

http://www.westmarine.com

http://www.whitworths.com.au/

Marintech Marketing, Singapore, marintech@pacific.net.sg (see also addresses), for a quick and friendly service in Singapore 

http://www.dexteritas.com

Discussion forums:

http://www.sailnet.com/

Regulations in Singapore:

http://www.mpa.gov.sg/

http://www.ida.gov.sg/

http://www.sailing.org.sg/

Travel in or out of Singapore:

http://www.changiairport.com.sg/changi/en/index.html?__locale=en :arrivals, departures and bookings at Change Airport

http://www.sbstransit.com.sg/ bus and train services in Singapore

Information on marinas in the region:

http://www.marinamap.com/en/map0906.shtml search for marinas in the region

http://www.noonsite.com  the website for world cruisers

Marinas in Singapore:
http://www.csc.org.sg/ Changi Sailing Club (only moorings)

http://www.marinakeppelbay.com/home.asp Keppel Marina

http://www.one15marina.com/new/index.htm One15 Marina (Sentosa)

http://www.countryclubs.com/ponggol-marina.php Punggol Marina

http://www.rafflesmarina.com.sg/ Raffles Marina

http://www.rsyc.org.sg/ Republic of Singapore Yacht Club

http://www.safyc.org.sg/ Singapore Armed Forces Yacht Club (Sembawang and Changi naval base)

Marinas Malaysia east coast:

http://www.sebanacove.com/ Sebana Cove Marina

a new marina in Tioman has been build (2006) and is located at Tekek (02.49.2 N,104.09.0E) on the west coast of Tioman

Marinas Riau islands (Batam):

http://www.nongsapointmarina.com/ (Nongsa Point, Batam)

Marinas Malaysia west coast:

http://www.noonsite.com/Countries/Malaysia/DangaBay (Johor Bahru)

http://www.admiralmarina.com (Port Dickson)

http://www.rsyc.com.my/ (Port Klang)

http://www.tgctmarina.com.my (Penang island, NE coast)

http://www.langkawiyachtclub.com/ (Langkawi at Kuah)

http://www.rebakmarina.com/ (Langkawi, Rebak island at the NW coast)

http://www.telagaharbour.com/ (Telaga Harbour, at the main island at the NW coast)

Marinas in Phuket:

http://www.acycphuket.com/ (Phuket, Au Chalong, SE in Phuket, anchorage only)

http://www.yacht-haven-phuket.com/ (Phuket, Yacht haven NE in Phuket)

http://www.phuketboatlagoon.com/ (Boat Lagoon, mid east in Phuket)

http://www.royalphuketmarina.com/ (just before Boat Lagoon, mid east in Phuket)