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I have a range of extensions in the shipping space, two in particular that are very useful and may be of benefit to people. They are commercial releases, this is to cover the costs of support and developing these, which is very much a full time job!
If you want to fully define rates yourself, and adjust for different products then ProductMatrix is a good option. This allows you to assign products to shipping groups then define the rates for these groups. It’s extremely flexible, which options such as cumulative, highest price totalling, percentage of cart value pricing, etc.
Alternatively if you are using another shipping method in Magento, say UPS or Fedex, and just want to add a premium under certain scenarios, e.g. for large items add $50 to cost and exclude shipping to Alaska, Hawaii, then Shipping Override is the extension to go for.
If you follow the links you can see screencasts of both extensions, and run the demos.
Feel free to contact me if you are unsure which best meets your needs. I am happy to provide a demo set up for your scenario pre-purchase, and I offer full post-sales support, 6 months ongoing, and 1 year of free upgrades.
Happy New Year all.