1) I would say all the suggestions EXCEPT share capital are valid. When it comes to the nitty gritty, if anything "majetkova ucast" is closer to "majetkove cenne papiry" than "zakladni jmeni/kapital". In your accounts, the majetkove ucasti are going to be grouped together with your equity shares, not the share capital.
2) I think "capital investment" is too specific - this means there is an understanding that the investment will be used to purchase fixed assets (http://www.investorwords.com/712/capital_investment.html or http://sbinfocanada.about.com/od/financing/g/capinvestment.h... I would say "majetkovy vklad" is simply contribution (i.e. with no specification of whether it is in cash - penezni - or in kind - vecny). Eurojust, for example, uses "contributions" (http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:...

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Note added at 1 day3 hrs (2009-01-31 23:10:45 GMT)
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I've been looking for a legal definition of "majetkovy vklad" in Czech legislation. All I can find is Zakon c. 42/1992 Sb. (only cooperatives, I'm afraid) - see Sections 16 and 20. I would say it backs up my argument (it encompasses financni/penezni/hmotne and nepenezitne/nehmotne vklady). Any other ideas for sources?

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Note added at 1 day16 hrs (2009-02-01 11:46:02 GMT)
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Hanka, you don't need a match between "majetek" and "majetkovy". I would avoid "property interest" because I think we normally reserve that for nemovitost (http://definitions.uslegal.com/p/property-interest/). The same for "property share" (http://www.availablehouse.com/propertyshare/index.php). As for contributions, as I wrote, they can be in kind or in cash (http://www.legalzoom.com/incorporation-glossary/capital-cont... For the use of "majetek" in the next sentence, consider perhaps the use of "asset" (=majetek, majetkova hodnota). In all honesty, if this were a translation of an article for a periodical, we'd probably translate majetkova ucast as stake or holding (but not in your text...).

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Note added at 1 day16 hrs (2009-02-01 12:09:28 GMT) Post-grading
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MAJETKOVE CI JINAK: this is just their way of covering all possibilities (ty osoby by mohly byt propojeny financne/personalne/pravne/fakticky ). So the "CI JINAK" you can translate simply as "or otherwise". The "majetek' depends on how you translate this term throughout the text ("by means of assets/property..." - something like that).