Emulation and a basic java file!
Well, here's the answer to your problems:
Nescube and MeBoy. Heres a description of both:
Nescube
In nescube, you save the game to your phone in .nes format and then open it using the program. The default buttons are not very good so it's best to change them in settings. It comes with a Mortal Kombat game, and emulation runs quite fast, depending on the speed of your phone.
MeBoy
In MeBoy, you download a computer program first. This makes a jar file which has all the games as part of it, so once its made, to add to it you have to make a new jar, however, this is better for phones like Motorola's which will not save files they cannot open.
A basic game for a basic phone!
Many phones have java when you would not expect them to, for example, the Nokia 3510i. If you have one of these phones, and are limited for space on it, but still want a fun game, try this website:http://www.mobileplayground.co.uk/3510igames.htm
Ringtones (cool sound effects)Free Sound Effects Download thousands of free sound effects from PartnersInRhyme.com These are really cool to download and there are LOADS of them.
News: 1. I have got a new phone (sony ericsson walkman) w580i and here is a tip on any sony ericsson phone press right star left left star left star to get a secret menu. 2. Google is making a web browser called google chrome here is a screenshot 
Music
It's easy to put music on your phone. If you have the music files on your computer, just use a Bluetooth Dongle or USB cable to send the files to your phone. If your phone has WAP internet access (see lower down) then you can also browse the internet to find the files. The most common format is MP3 but if you have a phone which does not support it then you may be able to find compatible files on the Internet. Many phones do not have much memory (I know my Razr only has 6MB) so if your phone is the the case then you may need to compress the files or use shorter tunes. A great program for making tunes shorter is audacity. PLEASE NOTE THAT IT MAY BE ILLEGAL TO DOWNLOAD COPIES OF TUNES OR MODIFY TUNES YOU DOWNLOAD.
If you find a YouTube video which has the music that you want, then download UltraGet video downloader to download the video and FLV Extract to extract the music as an MP3. It will create files around 1MB in size. Good Luck! 
Wap
Wap is a way of accessing the internet on your phone. It provides VERY basic access and can be quite expensive. It is normally possible to sign up for an unlimited plan with the company who provides you access. (see internet on phone for a better description. I use wap to download games from vodafone.Other providers like orange also let you download games.
Resources
Here are some links to some sites you could use to get resources for your phone. Theses have been tested on a Motorola Razr V3. Have fun!
Site useful for practically everything on your phone, videos, mp3s, backgrounds and games
http://www.3gpspot.com/ A great site for videos.
If you have a psp, you may want to check out this site: www.freewebs.com/pspupgrade 
To get any file you download onto your phone you can use a Bluetooth Dongle, bluetooth built into your pc (some have it and some dont) or a USB cable.
my modding page is at www.freewebs.com/motoresources/modding.htm
Get Your Own Scratch
%20embed%20src=%20http%3A%2F%2Fapps.rockyou.com%2Ftext-viewer.swf%3Finstanceid=0&givenText=Welcome%20to%20the%20best%20site%20on%20the%20internet.&givenFont=text-font_pokemon&style=Spinner1&bStyle=No%20Effect&bSize=0&tRot=3&sAlpha=0&sSize=0&tSize=45&tSpace=0&tBlur=0&tBevel=3&tGlow=10&c1=3365982&c2=16777213&c3=16777215&c4=15732509&c5=9454395&c6=1316119&ver=102&tSize=20&=undefined&textH=63&textW=902%20%20quality=%20high%20%20%20scale=%20noscale%20%20%20salign=%20lt%20%20width=%20902%20%20height=%2063%20%20wmode=%20transparent%20%20name=%20rockyou%20%20type=%20application%2Fx-shockwave-flash%20%20pluginspage=%20http%3A%2F%2Fwww.macromedia.com%2Fgo%2Fgetflashplayer%20%3E%20%2Fembed%3E