I have used Meego on my Lenovo S10-2. First things first. If you have meego now you will either have to dual boot it with another distro ubuntu lubuntu etc.
As I have suggested in your other question I would try to test which other one would better suit your pc. I have Ubuntu 11.04 with Unity working fine and dandy on my Lenovo S10-2 (yours might be slightly different to mine) but I have also had Kubuntu netbook edition running on it very well. I have also tested Lubuntu a while ago where it work ok too.
This issue here is not which one but what you want out of it for your netbook.
You cannot install Ubuntu components on top of your meego system but instead could either dual boot it or wipe your Meego off the pc at the Ubuntu install stage.
If you test any of the 'buntu flavours you may find that you have wifi issues but they are more easily resolved with them than in Meego and there is plenty of guidance here if you have Broadcom Drivers ( which I did). (Ubuntu installs these very well for you when you install it)
Meego is based on different architecture I guess to explain it than Ubuntu. So instead of installing .rpm packages you use .deb packages.
So, download a few different flavours and see which one looks better and feels better on your pc. Then if you are ready to change from Meego, back up your data that you want to keep (emails, documents favourites etc) and choose your flavour!
Installing either Ubuntu and or Meego (which I take it you have done already) is quite easy and painless and fast ( abit too fast for people like me who then change from one distro to another!)