Browser
http://www.operamini.com/download/pc/htc/htc_s620/

Search
http://mobile.google.com
http://www.google.com/mobile/ (pc based?)
Ask: http://m.ask.com/

Audio
Radio stations
http://mobile.coolsmartphone.com/radio.html

Out and about
National Rail Enquiries: http://wap.nationalrail.co.uk/
Transport for London: http://tflwap.gov.uk/
Somewherenear search engine: http://somewherenear.com/wap/
UKcompass Find nearby shops etc http://ukcompass.com/start.wml 

HTCS620 info
HTC phone: http://mobile.htc.com/
http://www.htc.com/europe/product.aspx?id=15748

News
BBC: http://www.bbc.co.uk/mobile/index.shtml
BBC Sport: http://news.bbc.co.uk/mobile/bbc_sport/index.shtml
BBC weather: http://www.bbc.co.uk/weather/mobile/
FT: http://wap.ft.com/

Sport
MK dons: http://miltonkeynes.wap.com/
Chelsea: http://wap.chelseafc.com
Livescores: http://wap.livescore.com/

Health
Direct gov: (incl NHS direct and many more links: http://mobile.direct.gov.uk/
pocketdoctor: http://wap.pocketdoctor.co.uk/
Epilepsy action: http://www.epilepsy.org.uk/wap 

Various

http://www.gpsforless.co.uk hardware goodies

http://internetsecurityandmaintenance.blogspot.com/

Docklands Light Railway: http://dlr.kizoom.co.uk/
Wapedia Mobile Encyclopedia: http://pda.wapedia.mobi/
Amazon: http://www.amazon.co.uk/gp/aw/h.html
for Yahoo Go!: http://mobile.yahoo.com/go