Do you mean on your PC/Mac or up here on the SC site?
If the former - get yourself another hard-drive. Got a 750Gb USB plug-in portable for about $100
If the latter - post on Flickr and just paste the BBCode in your nominated thread. My experience is that you'll actually get more feedback and exposure via Flickr. Hey if you can tolerate the ads then it's free!
I actually this problem on my hard drive. It is forcing me to delete all my crappy pictures Eventually, I'll upgrade the drive to 750 GBs. Performance of the machine (Macbook Pro) is being impacted by not having enough free disk space.
That is completely up to you. We want our Gallery to be a showcase of member photography, so please make use of it! However, our resources are finite, so it makes sense to use outside hosting if your needs exceed what we can provide.
Each member has 100MB allotted space in the Gallery. Site supporters (donors) get 500MB. These amounts are subject to change depending on our resources. If we downsize, you may lose images, so do not use our Gallery as your only place to store images!!!
I didnt realise you could embed from Sky Drive. I have two live.com accounts, 50G between them, could be very useful. I don't think I'll be renewing my flickr account next year.
Another place I use frequently is ImageShack® - Online Photo and Video Hosting. Accounts are free, and so far I have not found a limit to how many shots I can have but no doubt there is one. Imageshack gives a bazillion ways to embed, from linking to the actual shot page, to the shot itself, to thumbnails of the shot linking it, to links for forums, email etc. Its very flexible and is designed purely for hosting pix to display elsewhere, it is not really intended as a gallery site in and of itself, although it could be used that way. I tend to use it for stuff I don't necessarily think is flickr worthy.