Denmark

Oister
http://www.oister.dk/

Found this the most easy to get access. Oister uses "3" network (see below). Cards are sold in post offices for 99 kr inc 1 week of access. Additional time can be purchased online (1 week 79 kr). Coverage should be the same as for "3".

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Maximum Transfer Speed

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3 is a 3G only n etwork. Available throughout Denmark (reception may vary, of course) are: UMTS (384Kbit/s) and HSDPA (3,6 Mbit/s - which is available not only in large cities, but on the countryside as well). Important: 3 SIM cards can also be used in Sweden without additional costs since 3 operates a mobile network in Sweden as well!

Default data rate
SIM card is 149 kr. = ca. € 20 for a flatrate lasting one week, which should be sufficient for most travelers. There is a fair use policy limit for 2 GB transfer volume per week.

Data feature packs
29 kr. per day or 299 kr. per month are also available. Monthly usage is limited to 20 GB transfer volume.

Availability
You can get a SIM card online with a Danish address, or as an international customer at every 3 shop in Denmark. Such shops can also be found within large supermarkets such as Bilka. As of August 2011, official 3 shops did not offer prepaid SIM packages and directed to go find them at a 7-11.

SIM sizes
Standard SIM cards. Availability of micro SIM cards unknown.

Tethering
No problem (no extra charges).

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APN Settings

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 * APN: net.tre.dk
 * User name: none
 * Password: none

More information
http://www.3.dk

Maximum Transfer Speed
3G

Default data rate
SIM card is 50 DKK (under USD $10) and includes 35 kroner of credit. Data is charged at 2 kroner / MB (about USD $0.30 / MB). This means that without topping up you likely have several days worth of data available.

Data feature packs
None, pay-as-you-go only. However this is one of the lowest pay-as-you-go data rates I've ever seen.

Availability
No address needed. Walk into a participating store (many 7-11s in downtown Copenhagen, for instance), ask for a One Mobile sim card, pay cash. End of transaction.

The official list of providers is here: http://onemobile.dk/forhandlere.html

SIM sizes
Standard SIM cards. Availability of micro SIM cards unknown.

Tethering
No apparent problem.

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APN Settings

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 * APN: internet
 * if that's not enough, other fields can be filled with "internet" until it works

More information

 * http://onemobile.dk (Danish only)
 * Google translate link: http://translate.google.com/translate?js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&sl=auto&tl=en&u=http%3A%2F%2Fonemobile.dk

TDC
TDC's Bredbånd-2-GO Cash product allows data use, but does not (as far as I'm aware) include voice or texting.

Do not confuse this with their normal voice SIM card starter pack, which cannot be used with their cheaper data service. After wandering around downtown Copenhagen I mistakenly bought a pair of the voice only SIMs with extra credit, couldn't figure out how to activate data. Went to a TDC store only to be told the SIM cards I bought will not work with data service, and that they were sold out of the particular ones I should have bought. 7-11 wouldn't take the SIM cards back, and I couldn't find any other stores with the correct SIM card. The incorrect starter packs I bought were while with green on them, TDC MobilTid Startpakke, with 100DKK credit included.

So go find a TDC store if you want the correct SIM card.

Maximum transfer speed
1024/384 Kbit/s, up to 10 GB/month. Throttled if you exceed that.

Availability
Available in TDC Butik, Elgiganten, DSB Kort & Godt and 7-Eleven.

SIM sizes
Standard SIM. Micro SIM availability unknown.

Tethering
Unknown.

APN Settings
Unknown.

More information

 * http://privat.tdc.dk/publish.php?id=21420

Lebara Mobile

 * default rate 2,5DKK per MB
 * Data pack: 1GB for 49DKK (<7€, <10US$), if exceeded automatically renewed
 * max. 1Mbit/s
 * Starter packages (Startpakke, white/blue package) offered in several supermarkets (see website) and 7-11s, new SIM packages should be about 49DKK with 10DKK credit
 * reasonable prices for texts and minutes to Denmark and several European countries
 * In order to get the 1GB data pack working asap (not waiting for them to physically mail you your account password)...
 * Get to a computer with internet
 * Pop the SIM in your phone (with data service off so you don't burn away at the per MB limit)
 * Call their customer service number (50101010) which has a number of language options
 * Tell them you're traveling and need help setting up auto-topoff for the 1GB data service and don't have time to wait for them to send you your password via snail mail
 * After you're done registering on their site they'll SMS your SIM your account password
 * Log into the site and feed it a credit card
 * APN: internet.lebara.dk
 * Port no.: 8080
 * MCC: 238
 * MNC: 02
 * http://www.lebara.dk/en/