Some people have been asking whether they can attach large files in forum messages. Well, there is the solution of external storage and linking to them should you wish so.
Here is a number of sites providing these services for free:Cloud Storage & Unlimited Online Backup | Livedrive
50GB of free online cloud storageMediaFire
: 10GBUbuntu One
: 5GBRemote Backup, Remote Access for PCs, Macs and iPhones
10 Gbs free online storageAmazon Cloud Drive
: 5GB Dropbox
15 GB FREEDivshare
5 GB Uploadyousendit
Maximum file size for free option 100 MB
Files can be downloaded for 7 days
Maximum downloads per file 100
Bandwidth limit 1GBrapidshare.com
Host your files with the biggest (6 million files online) and fastest (12 Gigabit/s(!) up/down) 1-Click web-hosting service world-wide. No need to register. Just select a file and upload it. You will get your download-link and a secret delete-link immediately. We will host your file FOREVER! (Deleted only if there is not even one download for more than 30 days.)Free large file hosting. Send big files the easy way!
Upload files up to 300MBBigUpload
Bigupload Free File Hosting Provider!
You don`t need to registration and pay any fees. You don`t need to install any special software. A file can be up to 300 MB(and counting!). Host your file forever for free, until it is unused for 30 days. If nobody downloads your file for 30 days, it is automatically deleted. Try BigUpload right now and you will see why 100,000 people use it every day.http://www.turboupload.com/
Select and upload your file (maximum 70 MB)imageshack
You can use this service to upload images and insert them in forum posts (if you do not have attachment rights).
Use free image hosting solution. It can be used to share pictures with friends, as well as post images on message boards and blogs. It can also be used to direct link images on your personal website or online auction.Welcome to Flickr - Photo Sharing
Popular photo-sharing website
And here is a wikipedia article on Online file storage